diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bdbe18d4..0bb24c63 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,10 +55,10 @@ jobs:
             export FUCKMARK_CLIPBOARD_CAPTURE="$capture"
             output="$(printf 'I do not agree and I cannot stay.\n' | "$command" --stdin --copy)"
             printf '%s\n' "$output"
-            test "$output" = "I don't agree and I can't stay."
-            test "$(cat "$capture")" = "I don't agree and I can't stay."
+            test "$output" = "I do not agree and I cannot stay."
+            test "$(cat "$capture")" = "I do not agree and I cannot stay."
           done
-          test "$(printf 'I do not agree.\n' | FuckMark)" = "I don't agree."
+          test "$(printf 'I do not agree.\n' | FuckMark)" = "I do not agree."
 
   calibration-readiness:
     name: Frozen calibration readiness
diff --git a/.github/workflows/cycle8-carrier-detector.yml b/.github/workflows/cycle8-carrier-detector.yml
new file mode 100644
index 00000000..2c6dbe05
--- /dev/null
+++ b/.github/workflows/cycle8-carrier-detector.yml
@@ -0,0 +1,56 @@
+name: Cycle8 Carrier Detector
+
+on:
+  workflow_dispatch:
+    inputs:
+      device:
+        description: Torch device
+        required: true
+        default: cpu
+        type: string
+      max_attempts:
+        description: Deterministic retry budget for ASCII 64-token unique pairs
+        required: true
+        default: "64"
+        type: string
+  pull_request:
+    paths:
+      - ".github/workflows/cycle8-carrier-detector.yml"
+      - "fuckmark/cycle8/**"
+      - "fuckmark/cycle8_hf.py"
+      - "fuckmark/product/**"
+      - "tools/cycle8_fixture_compare.py"
+      - "tests/test_cycle8_fixture_compare.py"
+      - "requirements-smoke.txt"
+
+permissions:
+  contents: read
+
+jobs:
+  exploratory-890000:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 180
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+      - name: Install FuckMark
+        run: python -m pip install -e .
+      - name: Install exact CPU Torch runtime
+        run: python -m pip install "torch==2.13.0" --index-url https://download.pytorch.org/whl/cpu
+      - name: Install maintained Transformers SynthID dependencies
+        run: python -m pip install -r requirements-smoke.txt
+      - name: Run Cycle 8 exploratory detector compare on seed 890000
+        run: >-
+          python -m fuckmark.cycle8_hf
+          --device "${{ inputs.device || 'cpu' }}"
+          --max-attempts "${{ inputs.max_attempts || '64' }}"
+          --detector-json artifacts/cycle8-exploratory-890000/detector-compare.json
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: cycle8-exploratory-890000
+          path: artifacts/cycle8-exploratory-890000/
+          if-no-files-found: error
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96818e78..2d29dc03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## Unreleased — exact user-visible invariance
+
+- Restored Priority Zero: product output must keep the exact user-visible projection of the input.
+- Public CLI `release-cli-v4` fail-closes instead of applying contractions or other visible edits.
+- `release_transform_registry()` is the empty product-visible-invariance registry. Historical contraction/lexical/syntax/spacing catalogs remain replayable under explicit historical names.
+- Added `specs/fuckmark-user-visible-invariance-v1.contract.json` and Cycle 8 invisible-carrier research. No product-authorized carrier is promoted yet.
+- Reclassified Cycle 6 formal `NONZERO_RESIDUAL` 7/192 and Cycle 7 visible-edit stages as scientific evidence that is product-disqualified.
+- GitHub CI installed-CLI end-to-end now expects unchanged visible text, matching `release-cli-v4`.
+- Cycle 8 fixture compare reports visible-projection pass `20/20` for space-carrier arms.
+- Chromium `pre` screenshots: U+034F / U+FE00 pixel-equal; U+200C PNG bytes differ.
+- Detector-blind GPT-2 / SynthID development scoring on seeds `890000`, `900000`, and `910000` reduced watermarked detections for U+034F space-carrier x1 without unwatermarked inflation on these tiny 4-pair corpora. This is not confirmation and is not a product promotion.
+- Product contract loading uses the embedded v1 payload in installed wheels. Writers that replace pinned `specs/cycle8` tokenizer JSON refuse to run without a GPT-2 encoder; the detector harness still scores when tiktoken is absent. Chromium HTML evidence encodes less-than and greater-than as JSON unicode escapes so an ASCII script terminator cannot close the inline script.
+
 ## v0.2.0 — Exact-survival confirmation and release hardening
 
 ### Research
diff --git a/README.md b/README.md
index b298c49e..bd074eb9 100644
--- a/README.md
+++ b/README.md
@@ -9,9 +9,15 @@
 
 # FuckMark
 
-FuckMark is a deterministic, detector-blind research harness for studying how small text transformations change statistical watermark observations while preserving the source text as much as possible.
+FuckMark is a deterministic, detector-blind research harness and CLI for disrupting statistical text watermarks.
 
-**Current release: v0.2.0**  
+**Product contract (Priority Zero):** the user-visible text must not change. Product-safe transforms may modify only rigorously validated non-rendering Unicode representation while preserving exact visible projection. Semantic equivalence, "minor" punctuation edits, and extra visible spaces are not product success.
+
+The public CLI currently fail-closes: no product-authorized invisible carrier has been promoted yet, so `FuckMark` returns the original text unchanged rather than applying contractions or other visible edits. That is intentional. Historical visible-edit research remains replayable through explicitly named historical registries.
+
+See [`docs/product-contract.md`](docs/product-contract.md) and `specs/fuckmark-user-visible-invariance-v1.contract.json`.
+
+**Current tagged release: v0.2.0**  
 Website: [mark.q1z.org](https://mark.q1z.org)  
 License: MIT
 
@@ -36,11 +42,11 @@ The expanded `content-region-destruction-v1` pool and pairwise-completion schedu
 
 ## Claim boundary
 
-The 97.40% result is narrow research evidence, not a universal watermark-removal guarantee.
+The 97.40% Cycle 4 result is narrow research evidence, not a universal watermark-removal guarantee, and it is not a product-contract success: those schedulers selected visible-edit candidates.
 
-It applies to the repository's frozen open GPT-2 / Hugging Face SynthID Weighted Mean confirmation configuration, fixed threshold, exact source protocol, and measured corpus. It does not establish proprietary-detector transfer, arbitrary-model transfer, unknown future watermark transfer, perfect removal, or semantic equivalence under every input.
+It applies to the repository's frozen open GPT-2 / Hugging Face SynthID Weighted Mean confirmation configuration, fixed threshold, exact source protocol, and measured corpus. It does not establish proprietary-detector transfer, arbitrary-model transfer, unknown future watermark transfer, or perfect removal.
 
-The public CLI also remains deliberately conservative. It uses only the release transform registry. Development schedulers, detector code, experimental search, and the quarantined U+200C diagnostic registry are not automatically selected by the command-line product path.
+The public CLI uses only `release_transform_registry()`, which is now the product-visible-invariance registry. That registry currently contains zero authorized carriers. Development schedulers, detector code, experimental search, historical contraction/lexical/syntax rules, Cycle 6 spacing, Cycle 7 durable visible edits, and the quarantined U+200C diagnostic registry are not automatically selected by the command-line product path.
 
 ## Install
 
@@ -99,6 +105,8 @@ Stream mode:
 printf 'I do not agree.\n' | FuckMark
 ```
 
+The current product CLI prints the same visible text. It does not emit `I don't agree.`
+
 File mode:
 
 ```text
@@ -136,11 +144,17 @@ The U+200C mechanism is not promoted into release behavior. It can strongly pert
 
 ## Cycle 6 development status
 
-Cycle 6 reached **0 of 16 detected** on the frozen seed-720000 development corpus with the unchanged `0.5570987654320988` threshold and the raw, NFKC, Cf-strip, and combined sanitizer arms. The timestamp-independent corpus content hash is `b114cf4d869c5a5d78ac52855a1a480b1f0e605137aee2cb269062880fcc22d3`; the stable scored-result hash is `73f44b173d7ec55ea80e7d2e9a46b7ea70d8b32682f465dc66643387d99aa8b6`.
+Cycle 6 reached **0 of 16 detected** on the frozen seed-720000 development corpus with the unchanged `0.5570987654320988` threshold and the raw, NFKC, Cf-strip, and combined sanitizer arms. Formal confirmation froze **NONZERO_RESIDUAL 7/192** transformed-WM detections (2/64 + 2/64 + 3/64) with 0/192 matched transformed-UW detections.
+
+This is detector-endpoint scientific evidence, **PRODUCT_DISQUALIFIED**. The Cycle 6 workhorse inserted repeated ordinary ASCII U+0020 spaces, which are visible spacing changes. Do not treat 7/192, 0/16, or the older 96%+ Cycle 4 figure as proof that FuckMark currently meets the product goal.
+
+## Cycle 7 status
+
+Cycle 7 Stage A/B/C researched collapse-resistant *visible* edits (contractions, hyphenation, punctuation, newlines). Those results remain historically valid as **INSUFFICIENT_EVIDENCE** and are **PRODUCT_DISQUALIFIED**. They must not enter `release_transform_registry()`.
 
-This is detector-endpoint development evidence, not geometry zero and not a release claim. Surviving original observations remain in every output. The attack also relies on visible repeated ASCII spaces: NFKC and Cf stripping preserve them, but repeated-space canonicalization removes the mechanism and human fidelity review is still pending.
+## Cycle 8 status
 
-The Cycle 6 formal-confirmation harness is preregistered for three new 64-sample corpora with matched transformed-unwatermarked controls. Sealed detector scoring remains blocked until the full all-16 blind B14 fidelity packet receives independent human adjudication and its audit hash is bound into the confirmation contract.
+Cycle 8 is the exact-visible-projection generation. See [`docs/cycle8/README.md`](docs/cycle8/README.md). U+200C remains a diagnostic baseline (stripped by Cf). Combining grapheme joiner U+034F is an early durable-track *hypothesis* under frozen sanitizers; it is not a release mechanism.
 
 ## Reproduce the research environment
 
diff --git a/docs/cli.md b/docs/cli.md
index b8c31d4a..74fcbb38 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -1,10 +1,12 @@
 # FuckMark CLI
 
-FuckMark v0.2.0 exposes the same command under `FuckMark`, `Fuckmark`, and `fuckmark`. All aliases use `release-cli-v3` and the same content-addressed release transform registry.
+FuckMark v0.2.0 still exposes the same command under `FuckMark`, `Fuckmark`, and `fuckmark`. Current `main` uses `release-cli-v4` and the product visible-invariance registry.
 
-The public CLI is intentionally smaller than the research harness. It does not load detector code, watermark keys, model weights, network services, the Cycle 4 search schedulers, or quarantined U+200C diagnostics.
+The public CLI is intentionally smaller than the research harness. It does not load detector code, watermark keys, model weights, network services, Cycle 4/6/7 visible-edit schedulers, or quarantined U+200C diagnostics. It also does not apply contractions.
 
-Install instructions for Windows, macOS, and Linux are in [`install.md`](install.md). The official website is [mark.q1z.org](https://mark.q1z.org).
+**Priority Zero:** the CLI must not change user-visible text. Until a product-authorized invisible carrier exists, the CLI fail-closes and returns the input unchanged.
+
+Install instructions for Windows, macOS, and Linux are in [`install.md`](install.md). The official website is [mark.q1z.org](https://mark.q1z.org). The product contract is [`product-contract.md`](product-contract.md).
 
 ## Interactive use
 
@@ -16,7 +18,7 @@ FuckMark
 
 Paste the source text and finish with `:done` on its own line. The legacy `ok` terminator remains accepted.
 
-Interactive mode reports the exact project version, processes the text deterministically, reports the number of accepted release-safe changes, and copies the result to the platform clipboard. Color is emitted only when standard output is an interactive terminal. `--no-color` and the `NO_COLOR` environment variable disable ANSI output.
+Interactive mode reports the exact project version, processes the text deterministically, reports whether any product-authorized invisible transform was applied, and copies the result to the platform clipboard. Color is emitted only when standard output is an interactive terminal. `--no-color` and the `NO_COLOR` environment variable disable ANSI output.
 
 ## Stream use
 
@@ -26,6 +28,8 @@ Piped input automatically selects stream mode:
 printf 'I do not agree.\n' | FuckMark
 ```
 
+Current product output is the same visible line, not `I don't agree.`
+
 Use `--stdin` or `--non-interactive` to request the same mode explicitly. Standard output contains only transformed text. Clipboard access is disabled unless `--copy` is provided.
 
 ## File use
@@ -47,14 +51,14 @@ Without `--output`, file-mode output is written to standard output. `--output -`
 | `--version` | Print project, CLI, and release-registry identities. |
 | `--stdin`, `--non-interactive` | Read all standard input in explicit stream mode. |
 | `-o FILE`, `--output FILE` | Atomically write transformed UTF-8 text to a file. |
-| `--copy` | Also copy transformed text to the system clipboard. |
+| `--copy` | Also copy transformed text to the platform clipboard. |
 | `-q`, `--quiet` | Hide interactive processing and completion messages. |
 | `--no-color` | Disable ANSI terminal color. |
 
 ## Exit status
 
 | Status | Meaning |
-| ---: | --- |
+| ---: | ---: |
 | 0 | Transformation and requested outputs succeeded. |
 | 1 | Input, transformation, or output validation failed. |
 | 2 | Transformation succeeded, but clipboard transfer failed. The transformed text is still written to the requested non-clipboard destination or printed as fallback output. |
@@ -69,4 +73,4 @@ Errors are written to standard error. Empty input is rejected. Clipboard command
 
 ## Release boundary
 
-The CLI uses only `release_transform_registry()`. The confirmed Cycle 4 exact-survival result belongs to the research/evaluation path and is not a claim that the public CLI itself produces a 97.40% evasion rate. Development profiles, detector scoring, experimental search, and the U+200C diagnostic registry remain outside automatic release behavior.
+The CLI uses only `release_transform_registry()`, which means the exact visible-projection product contract, not "semantically conservative English edits." Historical contraction, Cycle 6 spacing, Cycle 7 durable visible edits, detector scoring, experimental search, and the U+200C diagnostic registry remain outside automatic release behavior.
diff --git a/docs/cycle7/README.md b/docs/cycle7/README.md
index c134c793..5f8462e4 100644
--- a/docs/cycle7/README.md
+++ b/docs/cycle7/README.md
@@ -1,8 +1,10 @@
-# Cycle 7 — durable transform development
+# Cycle 7 — durable visible-edit research (PRODUCT_DISQUALIFIED)
 
-Cycle 6 is **frozen**. Formal outcome: `NONZERO_RESIDUAL` **7/192**, not 0/192.
+Cycle 6 is **frozen**. Formal outcome: `NONZERO_RESIDUAL` **7/192**, not 0/192. That detector result remains historically valid and is **not** product-compliant FuckMark removal: Cycle 6 inserted visible ASCII spaces.
 
-This directory starts Cycle 7 development. It does not retune Cycle 6 and does not authorize a new formal confirmation.
+Cycle 7 researched collapse-resistant *visible* transforms. Those edits may preserve meaning. They still change user-visible text, so they are **PRODUCT_DISQUALIFIED** for the CLI/product path restored under `fuckmark-user-visible-invariance-v1`.
+
+Cycle 8 (`docs/cycle8/`) is the exact-visible-projection generation. Do not promote Cycle 7 catalogs into `release_transform_registry()`.
 
 ## Live state (verified 2026-08-25)
 
diff --git a/docs/cycle8/README.md b/docs/cycle8/README.md
new file mode 100644
index 00000000..7058f196
--- /dev/null
+++ b/docs/cycle8/README.md
@@ -0,0 +1,30 @@
+# Cycle 8 — exact visible projection
+
+Cycle 7 is frozen as **visible-edit durability research**. It is **PRODUCT_DISQUALIFIED** even where detector snapshots looked interesting.
+
+Cycle 8 is a new scientific generation. The mechanism class is hidden Unicode representation that leaves `VISIBLE(original)` identical to `VISIBLE(transformed)`.
+
+## Priority order
+
+0. Exact user-visible text preservation
+1. Real detector evasion
+2. Sanitizer durability
+3. Independent replication
+4. Protected machine-content safety
+5. Low hidden payload
+6. Mechanistic explanation
+7. Proxy metrics
+
+## Seed ledger
+
+See `docs/cycle8/seed-ledger.md`. Seeds `890000`, `900000`, `910000`, and `920000` were assigned before Cycle 8 generation. Do not inspect `830000` / `840000` / `850000`. Do not inspect Cycle 7 reserved `880000`.
+
+## Carrier research
+
+See `docs/cycle8/carrier-research.md`.
+
+U+200C is the diagnostic baseline. It is not durable under Cf-strip.
+
+Early durable-track *hypothesis* (sanitizer and tokenizer screen, not a detector claim): U+034F COMBINING GRAPHEME JOINER and variation selectors U+FE00..U+FE0F. These are not product-authorized.
+
+Fixture compare `specs/cycle8/fixture-compare-v1.json` reports visible-projection pass `20/20` across identity, U+200C, U+034F x1, U+034F x8, and U+FE00 arms. Quote interiors remain protected spans. Seed `890000` exploratory detector scoring is development-only (`PROMISING_DEVELOPMENT`, not confirmation). U+034F is not product-authorized.
diff --git a/docs/cycle8/carrier-research.md b/docs/cycle8/carrier-research.md
new file mode 100644
index 00000000..2320b9ab
--- /dev/null
+++ b/docs/cycle8/carrier-research.md
@@ -0,0 +1,41 @@
+# Cycle 8 carrier research
+
+Labels: `VERIFIED`, `HYPOTHESIS`, `REJECTED`, `PRODUCT_DISQUALIFIED`, `HISTORICAL_ONLY`, `UNKNOWN`.
+
+## H1. Normalization-stable non-Cf carrier
+
+`HYPOTHESIS` for product use. Sanitizer screen `VERIFIED` for U+034F and U+FE00..U+FE0F on the frozen arms:
+
+- category Mn, default-ignorable, combining class 0;
+- NFC/NFKC-stable in isolation;
+- survives Cf-strip (not Cf);
+- survives `whitespace-collapse-v1` when placed after an ASCII space.
+
+GPT-2 tokenizer screen `VERIFIED` on the Cycle 8 fixture (tiktoken `gpt2`): inserting U+034F after ASCII word spaces changed token IDs (`ids_equal=false`, token-count delta +40) with suffix realignment of only one token. An 8-copy space run produced delta +208. U+200C also disrupts GPT-2 (delta +28) but remains Cf-fragile.
+
+Not product-authorized. Fixture compare on four ASCII texts is `VERIFIED` for visible projection (`20/20`) and for U+034F / U+FE00 survival under Cf-strip, NFKC, and `whitespace-collapse-v1`. Chromium `pre` screenshots: U+034F and U+FE00 are `VERIFIED` pixel-equal to the original; U+200C is `REJECTED` (PNG bytes differ). Detector-blind GPT-2 / SynthID looks on seeds `890000`, `900000`, and `910000` are `PROMISING_DEVELOPMENT` / `HYPOTHESIS` only (four watermarked pairs per seed). Prefer U+034F x1: x8 overflowed GPT-2's 1024-token context on seed `900000`. The public CLI still authorizes zero carriers.
+
+## H2. Carrier runs at space boundaries
+
+`HYPOTHESIS`. Repeating an approved carrier after existing ASCII spaces increases hidden payload without splitting `[A-Za-z]+` words, so historical hard-invariant word matching still passes. This is the TransformRegistry-compatible high-density channel. Intra-word insertion is tokenizer-diagnostic only because it breaks the frozen hard-invariant word regex.
+
+## H3-H8
+
+Placement geometry, Cycle 6 scheduler reuse, and root-window correlation remain `HYPOTHESIS` for larger corpora. Tiny-corpus detector looks on seeds `890000`, `900000`, and `910000` are `PROMISING_DEVELOPMENT` only.
+
+## H9. Feasibility boundary
+
+Still `HYPOTHESIS`. If every tokenizer-disruptive invisible carrier is removed by ordinary sanitizers, Cycle 8 will freeze that boundary rather than weaken Priority Zero.
+
+## Rejected as product mechanisms
+
+| Mechanism | Label | Why |
+| --- | --- | --- |
+| Contractions / Cycle 7 durable edits | `PRODUCT_DISQUALIFIED` | visible words or punctuation change |
+| Cycle 6 U+0020 runs | `PRODUCT_DISQUALIFIED` | visible spacing change |
+| U+200C / other Cf | `REJECTED` as durable; diagnostic only | Cf-strip restores the original string |
+| NBSP / hair spaces / dashes / homoglyphs | `REJECTED` | visible or NFKC-mapped layout/glyph change |
+
+## Baseline
+
+U+200C after ASCII word spaces: visibility-aligned on the v1 projection, Cf-fragile, and Chromium-pixel-`REJECTED`. Keep as the diagnostic control. Do not promote to release.
diff --git a/docs/cycle8/seed-ledger.md b/docs/cycle8/seed-ledger.md
new file mode 100644
index 00000000..46500441
--- /dev/null
+++ b/docs/cycle8/seed-ledger.md
@@ -0,0 +1,27 @@
+# Cycle 8 seed ledger
+
+Ledger identity: `cycle8-seed-ledger-v1` (`fuckmark/cycle8/ledger.py`).
+
+Seeds were assigned **before** any Cycle 8 text generation or detector look.
+
+## Spent or blocked (forbidden)
+
+| Seed | Why |
+| --- | --- |
+| 760000, 770000, 780000 | Cycle 6 formal confirmation. Spent. |
+| 720000, 730000 | Cycle 6 development. Spent. |
+| 810000, 860000, 870000 | Cycle 7 exploratory. Spent for new rule construction. |
+| 820000 | Cycle 7 Stage B3 validation. Spent. |
+| 880000 | Cycle 7 reserved validation. Still unseen. Do not inspect from Cycle 8. |
+| 830000, 840000, 850000 | Confirmation reserved. Do not inspect. |
+
+## Cycle 8 roles
+
+| Role | Seed | Topic | May score detectors? |
+| --- | --- | --- | --- |
+| Exploratory development | 890000 | invisible carrier development | yes, development only |
+| Exploratory replication | 900000 | invisible carrier replication | yes, after freeze of a mechanism from 890000 |
+| Validation | 910000 | invisible carrier validation | only after a freeze; do not retune |
+| Secondary exploratory | 920000 | unused unless 890000 is exhausted | yes, development only |
+
+Do not promote 890000, 900000, 910000, or 920000 into confirmation after seeing scores.
diff --git a/docs/decisions/visible-invariance-correction.md b/docs/decisions/visible-invariance-correction.md
new file mode 100644
index 00000000..69fe1ca3
--- /dev/null
+++ b/docs/decisions/visible-invariance-correction.md
@@ -0,0 +1,39 @@
+# Decision: restore exact user-visible invariance
+
+Live GitHub at the start of this work:
+
+- repository `byte271/FuckMark` exists and is public;
+- `main` HEAD `d7eeb0f905b7046ddc4a4d8281354f06713d58b0` (PR #96 squash-merge);
+- PR #93, #94, #95, #96 merged;
+- no open PRs;
+- no open issues;
+- latest tag `v0.2.0`;
+- this environment's prebuilt checkout was stale at `ddccd74` until `origin/main` was fetched.
+
+## Violation
+
+The public CLI called `release_transform_registry()`, which resolved to `default_contraction_rules()`. Local reproduction before the fix:
+
+| Input | CLI output |
+| --- | --- |
+| `I do not agree.` | `I don't agree.` |
+| `We cannot continue.` | `We can't continue.` |
+| `You should not do that.` | `You shouldn't do that.` |
+
+Hard invariants allowed this because they checked protected spans, negation, and modality, not visible projection.
+
+Cycle 6 formal `NONZERO_RESIDUAL` 7/192 remains valid detector science and is **PRODUCT_DISQUALIFIED** (visible U+0020 runs).
+
+Cycle 7 Stage A/B/C remain **INSUFFICIENT_EVIDENCE** and **PRODUCT_DISQUALIFIED** (visible word/punctuation/layout edits).
+
+U+200C remains diagnostic: product-aligned on visibility, **REJECTED** as a durable mechanism because Cf-strip removes it.
+
+## Repair
+
+- Versioned contract `fuckmark-user-visible-invariance-v1`.
+- Visible-projection validator and product hard gate.
+- `release_transform_registry()` is an empty product registry.
+- CLI `release-cli-v4` fail-closes to original text.
+- Historical contraction/lexical/syntax/spacing registries remain for replay under explicit names.
+- Cycle 8 starts invisible-carrier research. Combining grapheme joiner U+034F is a durable-track sanitizer candidate, not a release promotion.
+- The GitHub CI installed-CLI check still expected contraction output after the product path was emptied. That leftover assertion is now aligned with unchanged visible text.
diff --git a/docs/product-contract.md b/docs/product-contract.md
new file mode 100644
index 00000000..278839a1
--- /dev/null
+++ b/docs/product-contract.md
@@ -0,0 +1,69 @@
+# FuckMark product contract
+
+Contract identity: `fuckmark-user-visible-invariance-v1`  
+Machine-readable file: `specs/fuckmark-user-visible-invariance-v1.contract.json`
+
+This contract is Priority Zero. Detector score cannot override it.
+
+## Rule
+
+`VISIBLE(original) == VISIBLE(transformed)`
+
+The public product path must present the same user-visible text as the input. Byte identity is not required. Visible identity is required.
+
+The v1 projection is insertion-only:
+
+- every original code point remains in the same order;
+- no original code point is substituted, deleted, or reordered;
+- visible ASCII spaces, tabs, and newlines are immutable;
+- the only allowed difference is insertion of *approved* non-rendering carriers.
+
+Conceptually, stripping approved carriers from the transformed string reproduces the original when the original did not already contain those carriers. If the original already contains an approved carrier, the product path fail-closes and inserts nothing.
+
+## What is not enough
+
+These are not product success:
+
+- semantic equivalence;
+- meaning preservation;
+- "looks natural";
+- minor visible difference;
+- punctuation-only edits;
+- hyphenation or apostrophe substitution;
+- extra or missing visible spaces;
+- newline / layout changes;
+- homoglyphs or compatibility characters.
+
+## Current product path
+
+`release_transform_registry()` is the product registry. It currently authorizes **zero** carriers.
+
+The public CLI (`release-cli-v4`) therefore returns the original text unchanged. That fail-closed behavior is required until a carrier has:
+
+1. exact visible-projection pass;
+2. English-ASCII v1 domain evidence;
+3. sanitizer evidence (whitespace collapse, and preferably NFKC + Cf-strip);
+4. GPT-2 tokenizer disruption evidence;
+5. protected machine-span safety;
+6. later, replicated detector reduction.
+
+U+200C is not authorized. It is a diagnostic baseline and is removed by Cf stripping.
+
+## Historical research
+
+Historical visible-edit registries remain importable for replay:
+
+- `historical_visible_edit_transform_registry()` / `default_transform_registry()` — contractions;
+- `development_transform_registry()` — contractions plus lexical/syntax/surface visible edits;
+- Cycle 6 spacing profiles;
+- Cycle 7 durable visible-edit catalogs.
+
+They must not become the CLI default.
+
+## Renderer and payload
+
+Output is ordinary Unicode plain text. HTML overlays, custom fonts, canvas, clipboard apps, and hidden metadata are forbidden.
+
+## Failure behavior
+
+If a candidate would change visible projection, if the input is outside ordinary English ASCII v1, if carrier safety is uncertain, or if a protected machine span would be broken, the product path leaves that region unchanged. It never falls back to a visible edit.
diff --git a/docs/release.md b/docs/release.md
index 97b6b00d..f55e5223 100644
--- a/docs/release.md
+++ b/docs/release.md
@@ -1,15 +1,18 @@
 # v0.2.0 Release Process
 
-FuckMark v0.2.0 is a deterministic CLI and research-infrastructure release. The release contains the Cycle 4 exact-survival research machinery and its confirmatory evidence path, while the public CLI remains restricted to the separately reviewed release transform registry.
+FuckMark v0.2.0 is a deterministic CLI and research-infrastructure release. The published tag remains historically valid. Current `main` after the visible-invariance repair still reports package version `0.2.0`, but the public CLI algorithm identity is `release-cli-v4` and the release registry is the empty product-visible-invariance registry. Do not treat the v0.2.0 tag's contraction behavior as the current product contract.
+
+The public CLI is restricted to product-authorized invisible transforms. None are authorized yet, so the CLI fail-closes to unchanged text. Cycle 4 exact-survival machinery remains in the research path.
 
 ## Release invariants
 
 1. `pyproject.toml`, `fuckmark.__version__`, `uv.lock`, installed CLI output, and the Git tag must agree on `0.2.0` / `v0.2.0`.
-2. The release registry is not broadened merely because a development experiment succeeds.
+2. The release registry is not broadened merely because a development experiment succeeds. Product authorization additionally requires exact visible-projection equality.
 3. U+200C remains diagnostic-only and is never promoted into automatic CLI behavior.
-4. Frozen historical contracts and evidence under `specs/` remain byte-stable unless their own protocol explicitly defines a successor artifact.
-5. The release must build and clean-install on Linux, macOS, and Windows.
-6. Every published GitHub Release must be backed by an immutable `v*` tag.
+4. Visible-edit historical catalogs (contractions, Cycle 6 spacing, Cycle 7 durable families) remain replayable and must not silently become release defaults.
+5. Frozen historical contracts and evidence under `specs/` remain byte-stable unless their own protocol explicitly defines a successor artifact.
+6. The release must build and clean-install on Linux, macOS, and Windows.
+7. Every published GitHub Release must be backed by an immutable `v*` tag.
 
 ## Required release sequence
 
@@ -53,7 +56,7 @@ The expanded pool plus scheduler v2 achieved 0/12 detected in its fresh developm
 
 `specs/fuckmark-v0.1.0-release-readiness-baseline.json` remains an immutable historical artifact. v0.2.0 does not rewrite the old baseline's gate statuses or reinterpret the repository state it captured.
 
-Likewise, rejected experiments remain rejected records. The U+200C visible-projection mechanism stays quarantined because Unicode format-character stripping restores the evaluated detection behavior.
+Likewise, rejected experiments remain rejected records. The U+200C visible-projection mechanism stays quarantined because Unicode format-character stripping restores the evaluated detection behavior. Cycle 6 `NONZERO_RESIDUAL` 7/192 remains the frozen formal detector result and is product-disqualified because it used visible ASCII spaces.
 
 ## Distribution scope
 
diff --git a/evidence/cycle8-exploratory-890000-2026-08-25/README.md b/evidence/cycle8-exploratory-890000-2026-08-25/README.md
new file mode 100644
index 00000000..e0afbba9
--- /dev/null
+++ b/evidence/cycle8-exploratory-890000-2026-08-25/README.md
@@ -0,0 +1,24 @@
+# Cycle 8 exploratory detector evidence (seed 890000)
+
+Development-only. Not confirmation. Seed `890000` is the Cycle 8 exploratory ledger entry.
+
+Mechanism under test: U+034F space-carrier x1 (and matched x8 / U+200C / identity arms). Transform selection is detector-blind (`apply_all` at non-overlapping ASCII spaces). Detector access was not used for selection.
+
+Files:
+
+- `fixture-compare.json` — hand fixtures plus attached detector summaries.
+- `detector-compare.json` — GPT-2 / Hugging Face SynthID Weighted Mean scores on four ASCII domain pairs.
+- `decision.json` — `PROMISING_DEVELOPMENT`, `VISIBLE_INVARIANT_PASS`, `HYPOTHESIS`.
+
+Headline on this tiny corpus (4 watermarked + 4 unwatermarked):
+
+| Arm | WM detected raw | UW detected raw | WM detected after Cf-strip |
+| --- | ---: | ---: | ---: |
+| identity | 3/4 | 0/4 | 3/4 |
+| U+034F x1 | 0/4 | 0/4 | 0/4 |
+| U+034F x8 | 0/4 | 0/4 | 0/4 |
+| U+200C x1 | 0/4 | 0/4 | 3/4 |
+
+Visible projection pass rate on scored arms: `32/32`.
+
+Do not promote U+034F into `release_transform_registry()`. Do not inspect `830000`, `840000`, `850000`, or Cycle 7 reserved `880000`.
diff --git a/evidence/cycle8-exploratory-890000-2026-08-25/SHA256SUMS.txt b/evidence/cycle8-exploratory-890000-2026-08-25/SHA256SUMS.txt
new file mode 100644
index 00000000..309e8bc8
--- /dev/null
+++ b/evidence/cycle8-exploratory-890000-2026-08-25/SHA256SUMS.txt
@@ -0,0 +1,4 @@
+07403a72b6728072b7c1bdf359f389a34681844da6efc1c62fa59000a7c90668  README.md
+c6cb44176f27d95c8fec70a785a512616d9f3b178154025f6162136fbd1762c7  decision.json
+edf0d189433c961e47f440cbde8a626bc39fb7af5acfe8444ad76c0b7a3d9eb0  detector-compare.json
+8abb742a9c435db86969d33d104344b0687f0643fe93a784f781f16e017a5355  fixture-compare.json
diff --git a/evidence/cycle8-exploratory-890000-2026-08-25/decision.json b/evidence/cycle8-exploratory-890000-2026-08-25/decision.json
new file mode 100644
index 00000000..58ff5a3c
--- /dev/null
+++ b/evidence/cycle8-exploratory-890000-2026-08-25/decision.json
@@ -0,0 +1 @@
+{"algorithm_version":"cycle8-fixture-decision-v1","decision":"PROMISING_DEVELOPMENT","detector_signal":{"identity_raw_unwatermarked_detected":0,"identity_raw_watermarked_detected":3,"u034f_raw_unwatermarked_detected":0,"u034f_raw_watermarked_detected":0,"u034f_run_raw_watermarked_detected":0,"u034f_ws_collapse_watermarked_detected":0,"u200c_raw_watermarked_detected":0,"watermarked_row_count":4},"evidence_label":"HYPOTHESIS","notes":"This is Cycle 8 development classification, not confirmation. Do not inspect 830000, 840000, 850000, or Cycle 7 reserved 880000. U+034F is not product-authorized.","product_gate":"VISIBLE_INVARIANT_PASS","reasons":["U+200C is removed by Cf-strip","U+034F survives Cf-strip on the GPT-2 fixture","U+034F survives NFKC on the GPT-2 fixture","U+034F survives whitespace-collapse-v1 after ASCII spaces","quote interiors block U+034F space carriers as protected spans","U+034F space insertion changes GPT-2 token ids","U+034F x8 increases hidden payload over x1","U+FE00 survives Cf-strip on the GPT-2 fixture","detector scores are development-only","U+034F reduced raw watermarked detections without raising unwatermarked detections"],"visible_failures":0}
diff --git a/evidence/cycle8-exploratory-890000-2026-08-25/detector-compare.json b/evidence/cycle8-exploratory-890000-2026-08-25/detector-compare.json
new file mode 100644
index 00000000..46ea1907
--- /dev/null
+++ b/evidence/cycle8-exploratory-890000-2026-08-25/detector-compare.json
@@ -0,0 +1 @@
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diff --git a/evidence/cycle8-replication-900000-2026-08-25/README.md b/evidence/cycle8-replication-900000-2026-08-25/README.md
new file mode 100644
index 00000000..51816f22
--- /dev/null
+++ b/evidence/cycle8-replication-900000-2026-08-25/README.md
@@ -0,0 +1,20 @@
+# Cycle 8 replication detector evidence (seed 900000)
+
+Development replication after freezing U+034F space-carrier x1 from seed `890000`. Not confirmation. Topic: `invisible carrier replication`.
+
+Same detector-blind arms. No retune.
+
+Headline (4 watermarked + 4 unwatermarked):
+
+| Arm | WM detected raw | UW detected raw | WM detected after Cf-strip |
+| --- | ---: | ---: | ---: |
+| identity | 4/4 | 0/4 | 4/4 |
+| U+034F x1 | 0/4 | 0/4 | 0/4 |
+| U+034F x8 | 0/4 | 0/4 | 0/4 |
+| U+200C x1 | 0/4 | 0/4 | 4/4 |
+
+Visible projection pass rate: `32/32`.
+
+U+034F x8 overflowed the GPT-2 1024-token context on one technical-explanation sample (1055 tokens). Prefer x1. x8 scores on that row are not a clean observation.
+
+Do not promote U+034F into the product CLI.
diff --git a/evidence/cycle8-replication-900000-2026-08-25/SHA256SUMS.txt b/evidence/cycle8-replication-900000-2026-08-25/SHA256SUMS.txt
new file mode 100644
index 00000000..180fd472
--- /dev/null
+++ b/evidence/cycle8-replication-900000-2026-08-25/SHA256SUMS.txt
@@ -0,0 +1,4 @@
+f68ec6727a0d9712be417ac6752a5748526a3601e76d236078eeb801085e8355  README.md
+6dd5f4e367cc11fc300b8abde8885e05557e7dd4390306d7e89dd48a20c57cc8  decision.json
+01aeea3aa7a9d9908e8d8cb20b80b7f452e8f1b900edd44d94f6f4c04fb5e3a6  detector-compare.json
+2519e670869dfb215694756e1aea0c199aad4bec712cb3276cbb509fc8cbbd42  fixture-compare.json
diff --git a/evidence/cycle8-replication-900000-2026-08-25/decision.json b/evidence/cycle8-replication-900000-2026-08-25/decision.json
new file mode 100644
index 00000000..b5c7284d
--- /dev/null
+++ b/evidence/cycle8-replication-900000-2026-08-25/decision.json
@@ -0,0 +1 @@
+{"algorithm_version":"cycle8-fixture-decision-v1","decision":"PROMISING_DEVELOPMENT","detector_signal":{"identity_raw_unwatermarked_detected":0,"identity_raw_watermarked_detected":4,"u034f_raw_unwatermarked_detected":0,"u034f_raw_watermarked_detected":0,"u034f_run_raw_watermarked_detected":0,"u034f_ws_collapse_watermarked_detected":0,"u200c_raw_watermarked_detected":0,"watermarked_row_count":4},"evidence_label":"HYPOTHESIS","notes":"This is Cycle 8 development classification, not confirmation. Do not inspect 830000, 840000, 850000, or Cycle 7 reserved 880000. U+034F is not product-authorized.","product_gate":"VISIBLE_INVARIANT_PASS","reasons":["U+200C is removed by Cf-strip","U+034F survives Cf-strip on the GPT-2 fixture","U+034F survives NFKC on the GPT-2 fixture","U+034F survives whitespace-collapse-v1 after ASCII spaces","quote interiors block U+034F space carriers as protected spans","U+034F space insertion changes GPT-2 token ids","U+034F x8 increases hidden payload over x1","U+FE00 survives Cf-strip on the GPT-2 fixture","detector scores are development-only","U+034F reduced raw watermarked detections without raising unwatermarked detections"],"visible_failures":0}
diff --git a/evidence/cycle8-replication-900000-2026-08-25/detector-compare.json b/evidence/cycle8-replication-900000-2026-08-25/detector-compare.json
new file mode 100644
index 00000000..6a9eee12
--- /dev/null
+++ b/evidence/cycle8-replication-900000-2026-08-25/detector-compare.json
@@ -0,0 +1 @@
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diff --git a/evidence/cycle8-validation-910000-2026-08-25/README.md b/evidence/cycle8-validation-910000-2026-08-25/README.md
new file mode 100644
index 00000000..953e6f19
--- /dev/null
+++ b/evidence/cycle8-validation-910000-2026-08-25/README.md
@@ -0,0 +1,16 @@
+# Cycle 8 validation detector evidence (seed 910000)
+
+Held-out validation after freezing U+034F space-carrier x1. Not confirmation. Topic: `invisible carrier validation`. No retune.
+
+Headline (4 watermarked + 4 unwatermarked):
+
+| Arm | WM detected raw | UW detected raw | WM detected after Cf-strip |
+| --- | ---: | ---: | ---: |
+| identity | 3/4 | 0/4 | 3/4 |
+| U+034F x1 | 0/4 | 0/4 | 0/4 |
+| U+034F x8 | 0/4 | 0/4 | 0/4 |
+| U+200C x1 | 0/4 | 0/4 | 3/4 |
+
+Visible projection pass rate: `32/32`.
+
+Do not promote U+034F into `release_transform_registry()`. Do not inspect confirmation-reserved seeds.
diff --git a/evidence/cycle8-validation-910000-2026-08-25/SHA256SUMS.txt b/evidence/cycle8-validation-910000-2026-08-25/SHA256SUMS.txt
new file mode 100644
index 00000000..881c9e45
--- /dev/null
+++ b/evidence/cycle8-validation-910000-2026-08-25/SHA256SUMS.txt
@@ -0,0 +1,4 @@
+7e1c3c5212723ba5b0af5c4771e8b8c76852e38c5f8712102f88cc99a210a689  README.md
+c6cb44176f27d95c8fec70a785a512616d9f3b178154025f6162136fbd1762c7  decision.json
+368d3290f09042aee25bae0058276e339b4503255231a62c3e864578415ec604  detector-compare.json
+cb8d20cbd096a3563a0f082d4670609f1e60b42ec9315f3c83867cc2ea88ad7b  fixture-compare.json
diff --git a/evidence/cycle8-validation-910000-2026-08-25/decision.json b/evidence/cycle8-validation-910000-2026-08-25/decision.json
new file mode 100644
index 00000000..58ff5a3c
--- /dev/null
+++ b/evidence/cycle8-validation-910000-2026-08-25/decision.json
@@ -0,0 +1 @@
+{"algorithm_version":"cycle8-fixture-decision-v1","decision":"PROMISING_DEVELOPMENT","detector_signal":{"identity_raw_unwatermarked_detected":0,"identity_raw_watermarked_detected":3,"u034f_raw_unwatermarked_detected":0,"u034f_raw_watermarked_detected":0,"u034f_run_raw_watermarked_detected":0,"u034f_ws_collapse_watermarked_detected":0,"u200c_raw_watermarked_detected":0,"watermarked_row_count":4},"evidence_label":"HYPOTHESIS","notes":"This is Cycle 8 development classification, not confirmation. Do not inspect 830000, 840000, 850000, or Cycle 7 reserved 880000. U+034F is not product-authorized.","product_gate":"VISIBLE_INVARIANT_PASS","reasons":["U+200C is removed by Cf-strip","U+034F survives Cf-strip on the GPT-2 fixture","U+034F survives NFKC on the GPT-2 fixture","U+034F survives whitespace-collapse-v1 after ASCII spaces","quote interiors block U+034F space carriers as protected spans","U+034F space insertion changes GPT-2 token ids","U+034F x8 increases hidden payload over x1","U+FE00 survives Cf-strip on the GPT-2 fixture","detector scores are development-only","U+034F reduced raw watermarked detections without raising unwatermarked detections"],"visible_failures":0}
diff --git a/evidence/cycle8-validation-910000-2026-08-25/detector-compare.json b/evidence/cycle8-validation-910000-2026-08-25/detector-compare.json
new file mode 100644
index 00000000..86f4cebc
--- /dev/null
+++ b/evidence/cycle8-validation-910000-2026-08-25/detector-compare.json
@@ -0,0 +1 @@
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diff --git a/fuckmark/__init__.py b/fuckmark/__init__.py
index 8e216201..c17fec65 100644
--- a/fuckmark/__init__.py
+++ b/fuckmark/__init__.py
@@ -128,6 +128,7 @@
     bind_blind_review_judgment,
     bind_blind_review_judgments,
     build_blind_review_packet,
+    source_verified_historical_visible_edit_transform_registry,
     source_verified_release_transform_registry,
     verify_fidelity_review_sample,
     verify_blind_review_packet,
@@ -195,6 +196,7 @@
     development_lexical_rules,
     development_syntax_rules,
     development_transform_registry,
+    historical_visible_edit_transform_registry,
     hard_invariant_signature,
     release_transform_registry,
     require_complete_lexical_audit_summaries,
@@ -233,6 +235,7 @@
     "bind_blind_review_judgment",
     "bind_blind_review_judgments",
     "build_blind_review_packet",
+    "source_verified_historical_visible_edit_transform_registry",
     "source_verified_release_transform_registry",
     "verify_fidelity_review_sample",
     "verify_blind_review_packet",
@@ -416,6 +419,7 @@
     "UserProtectedRange",
     "default_contraction_rules",
     "default_transform_registry",
+    "historical_visible_edit_transform_registry",
     "validate_protected_invariants",
     "ZeroValidObservationsError",
 ]
diff --git a/fuckmark/cli.py b/fuckmark/cli.py
index 8c18933d..5f64cfb3 100644
--- a/fuckmark/cli.py
+++ b/fuckmark/cli.py
@@ -12,12 +12,13 @@
 from typing import TextIO
 
 from . import __project_name__, __version__
+from .product.visible_projection import is_carrier_insertion_v1, product_approved_carriers_v1
 from .transforms import TRANSFORM_REGISTRY_ALGORITHM_VERSION, release_transform_registry
 
 
 CLI_TERMINATORS = frozenset({":done", "ok"})
 CLI_SELECTION_SEED = 0
-RELEASE_CLI_ALGORITHM_VERSION = "release-cli-v3"
+RELEASE_CLI_ALGORITHM_VERSION = "release-cli-v4"
 _ANSI_BLUE = "\033[38;5;39m"
 _ANSI_GREEN = "\033[38;5;40m"
 _ANSI_YELLOW = "\033[38;5;214m"
@@ -53,7 +54,12 @@ def transform_text(text: str) -> ProcessResult:
         occupied_until = candidate.end
     if not selected:
         return ProcessResult(text, 0)
-    result = registry.apply(enumeration, tuple(selected), seed=CLI_SELECTION_SEED)
+    try:
+        result = registry.apply(enumeration, tuple(selected), seed=CLI_SELECTION_SEED)
+    except (KeyError, TypeError, ValueError):
+        return ProcessResult(text, 0)
+    if not is_carrier_insertion_v1(text, result.output_text, product_approved_carriers_v1()):
+        return ProcessResult(text, 0)
     return ProcessResult(result.output_text, len(result.trace.operations))
 
 
@@ -76,7 +82,7 @@ def read_pasted_text(input_stream: TextIO, output_stream: TextIO) -> str:
 def _parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(
         prog=__project_name__,
-        description="Apply FuckMark's deterministic, release-safe English text transforms.",
+        description="Apply FuckMark product-authorized invisible transforms without changing user-visible text.",
         epilog=(
             "Examples:\n"
             "  FuckMark\n"
@@ -263,7 +269,7 @@ def main(
 
     if interactive and not arguments.quiet:
         output.write(_styled(f"{__project_name__} {__version__}", _ANSI_BOLD + _ANSI_BLUE, enabled=color))
-        output.write("\nDeterministic English text transform\n\n")
+        output.write("\nProduct path: exact user-visible text preservation.\n\n")
         output.flush()
 
     try:
@@ -308,9 +314,9 @@ def main(
     if interactive and not arguments.quiet:
         if result.changed:
             noun = "change" if result.change_count == 1 else "changes"
-            message = f"Done — {result.change_count} {noun} applied."
+            message = f"Done — {result.change_count} product-authorized invisible {noun} applied."
         else:
-            message = "Done — no eligible release-safe changes."
+            message = "Done — no product-authorized invisible transform; visible text left unchanged."
         output.write(_styled(message, _ANSI_GREEN, enabled=color) + "\n")
         if arguments.output not in (None, "-"):
             output.write(f"Saved to {arguments.output}\n")
diff --git a/fuckmark/cycle8/__init__.py b/fuckmark/cycle8/__init__.py
new file mode 100644
index 00000000..e2a34cec
--- /dev/null
+++ b/fuckmark/cycle8/__init__.py
@@ -0,0 +1,66 @@
+from .ledger import (
+    CYCLE8_CONFIRMATION_RESERVED_SEED_BASES,
+    CYCLE8_EXPLORATORY_SEED_BASE,
+    CYCLE8_LEDGER_VERSION,
+    CYCLE8_REPLICATION_SEED_BASE,
+    CYCLE8_VALIDATION_SEED_BASE,
+    assert_cycle8_development_seed,
+    cycle8_seed_ledger_hash,
+    cycle8_seed_ledger_payload,
+)
+from .compare import (
+    CYCLE8_DETECTOR_ARM_IDS,
+    CYCLE8_FIXTURE_COMPARE_VERSION,
+    measure_carrier_arm,
+    run_fixture_compare,
+)
+from .decision import CYCLE8_DECISION_VERSION, classify_fixture_compare
+from .registry import (
+    apply_all_candidates,
+    cycle8_combined_carrier_registry,
+    cycle8_letter_carrier_registry,
+    cycle8_space_carrier_registry,
+)
+from .scoreboard import CYCLE8_SCOREBOARD_VERSION, EvidenceLabel, ProductGate, product_scoreboard_payload
+from .tokenizer_screen import GPT2_FIXTURE, load_gpt2_encoder, require_gpt2_encoder, screen_carrier_tokenizer
+from .unicode_meta import (
+    UNICODE_PROPERTY_SCAN_VERSION,
+    audit_codepoints,
+    classify_carrier_hypothesis,
+    codepoint_properties,
+    iter_default_ignorable_codepoints_v1,
+)
+
+__all__ = [
+    "CYCLE8_CONFIRMATION_RESERVED_SEED_BASES",
+    "CYCLE8_DECISION_VERSION",
+    "CYCLE8_DETECTOR_ARM_IDS",
+    "CYCLE8_EXPLORATORY_SEED_BASE",
+    "CYCLE8_FIXTURE_COMPARE_VERSION",
+    "CYCLE8_LEDGER_VERSION",
+    "CYCLE8_REPLICATION_SEED_BASE",
+    "CYCLE8_SCOREBOARD_VERSION",
+    "CYCLE8_VALIDATION_SEED_BASE",
+    "EvidenceLabel",
+    "GPT2_FIXTURE",
+    "ProductGate",
+    "UNICODE_PROPERTY_SCAN_VERSION",
+    "apply_all_candidates",
+    "assert_cycle8_development_seed",
+    "audit_codepoints",
+    "classify_carrier_hypothesis",
+    "classify_fixture_compare",
+    "codepoint_properties",
+    "cycle8_combined_carrier_registry",
+    "cycle8_letter_carrier_registry",
+    "cycle8_seed_ledger_hash",
+    "cycle8_seed_ledger_payload",
+    "cycle8_space_carrier_registry",
+    "iter_default_ignorable_codepoints_v1",
+    "load_gpt2_encoder",
+    "require_gpt2_encoder",
+    "measure_carrier_arm",
+    "product_scoreboard_payload",
+    "run_fixture_compare",
+    "screen_carrier_tokenizer",
+]
diff --git a/fuckmark/cycle8/compare.py b/fuckmark/cycle8/compare.py
new file mode 100644
index 00000000..0d47e082
--- /dev/null
+++ b/fuckmark/cycle8/compare.py
@@ -0,0 +1,164 @@
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+
+from ..cycle7.fixtures import CONTRACTION_SPARSE, QUOTE_INTERIOR
+from ..cycle7.whitespace_collapse import CYCLE7_SANITIZER_VARIANT_IDS, sanitize_cycle7_variant
+from ..hashing import sha256_json, sha256_text
+from ..product.registry import product_transform_registry
+from ..product.visible_projection import is_carrier_insertion_v1, project_visible_v1
+from ..transforms.schema import CandidateRejectionReason
+from .registry import cycle8_space_carrier_registry, select_nonoverlapping_candidate_ids
+from .tokenizer_screen import GPT2_FIXTURE, resynchronization_metrics
+
+
+CYCLE8_FIXTURE_COMPARE_VERSION = "cycle8-fixture-compare-v1"
+CYCLE8_IDENTITY_ARM_ID = "identity"
+CYCLE8_U200C_SPACE_ARM_ID = "u200c-space-x1"
+CYCLE8_U034F_SPACE_ARM_ID = "u034f-space-x1"
+CYCLE8_U034F_SPACE_RUN_ARM_ID = "u034f-space-x8"
+CYCLE8_UFE00_SPACE_ARM_ID = "ufe00-space-x1"
+CYCLE8_DETECTOR_ARM_IDS = (
+    CYCLE8_IDENTITY_ARM_ID,
+    CYCLE8_U200C_SPACE_ARM_ID,
+    CYCLE8_U034F_SPACE_ARM_ID,
+    CYCLE8_U034F_SPACE_RUN_ARM_ID,
+)
+CYCLE8_FIXTURE_ARM_IDS = (
+    *CYCLE8_DETECTOR_ARM_IDS,
+    CYCLE8_UFE00_SPACE_ARM_ID,
+)
+CYCLE8_MAX_ATTEMPTS = 64
+_ARM_SPEC = {
+    CYCLE8_IDENTITY_ARM_ID: None,
+    CYCLE8_U200C_SPACE_ARM_ID: (0x200C, 1),
+    CYCLE8_U034F_SPACE_ARM_ID: (0x034F, 1),
+    CYCLE8_U034F_SPACE_RUN_ARM_ID: (0x034F, 8),
+    CYCLE8_UFE00_SPACE_ARM_ID: (0xFE00, 1),
+}
+
+
+def cycle8_fixture_samples() -> tuple[tuple[str, str], ...]:
+    return (
+        ("gpt2-screen", GPT2_FIXTURE),
+        ("contraction-sparse", CONTRACTION_SPARSE),
+        ("quote-interior", QUOTE_INTERIOR),
+        ("url-protected", "See https://example.com/do-not-touch and continue the notes."),
+    )
+
+
+def arm_approved_carriers(arm_id: str) -> tuple[int, ...]:
+    spec = _ARM_SPEC[arm_id]
+    if spec is None:
+        return ()
+    return (spec[0],)
+
+
+def arm_registry(arm_id: str):
+    spec = _ARM_SPEC[arm_id]
+    if spec is None:
+        return product_transform_registry()
+    codepoint, repeats = spec
+    return cycle8_space_carrier_registry(codepoint, repeats=repeats)
+
+
+def measure_carrier_arm(
+    *,
+    arm_id: str,
+    source_sample_id: str,
+    source_text: str,
+    encoder: Callable[[str], tuple[int, ...]] | None = None,
+) -> dict[str, object]:
+    if arm_id not in _ARM_SPEC:
+        raise ValueError("unknown Cycle 8 arm id")
+    if not isinstance(source_sample_id, str) or not source_sample_id:
+        raise ValueError("source_sample_id must be a non-empty string")
+    if not isinstance(source_text, str):
+        raise TypeError("source_text must be a string")
+    registry = arm_registry(arm_id)
+    approved = arm_approved_carriers(arm_id)
+    enumeration = registry.enumerate(source_text)
+    selected = select_nonoverlapping_candidate_ids(enumeration)
+    transformed = source_text if not selected else registry.apply(enumeration, selected).output_text
+    visible_ok = is_carrier_insertion_v1(source_text, transformed, approved)
+    carrier = chr(approved[0]) if approved else ""
+    inserted = transformed.count(carrier) - source_text.count(carrier) if carrier else 0
+    sanitizers = {}
+    for variant in CYCLE7_SANITIZER_VARIANT_IDS:
+        sanitized = sanitize_cycle7_variant(variant, transformed)
+        sanitizers[variant] = {
+            "equals_source": sanitized == source_text,
+            "equals_transformed": sanitized == transformed,
+            "visible_ok": is_carrier_insertion_v1(source_text, sanitized, approved),
+            "text_hash": sha256_text(sanitized),
+        }
+    tokenizer = None
+    if encoder is not None:
+        tokenizer = resynchronization_metrics(encoder(source_text), encoder(transformed))
+    quote_blocked = sum(
+        1 for rejection in enumeration.rejections if rejection.reason is CandidateRejectionReason.QUOTE_POLICY_BLOCKED
+    )
+    protected_blocked = sum(
+        1 for rejection in enumeration.rejections if rejection.reason is CandidateRejectionReason.PROTECTED_OVERLAP
+    )
+    return {
+        "arm_id": arm_id,
+        "source_sample_id": source_sample_id,
+        "source_text_hash": sha256_text(source_text),
+        "transformed_text": transformed,
+        "transformed_text_hash": sha256_text(transformed),
+        "candidate_count": len(enumeration.candidates),
+        "selected_count": len(selected),
+        "inserted_count": inserted,
+        "utf8_overhead": len(transformed.encode("utf-8")) - len(source_text.encode("utf-8")),
+        "visible_ok": visible_ok,
+        "projected_equals_source": project_visible_v1(transformed, approved) == source_text,
+        "quote_blocked_count": quote_blocked,
+        "protected_blocked_count": protected_blocked,
+        "sanitizers": sanitizers,
+        "tokenizer": tokenizer,
+    }
+
+
+def summarize_arm(measurement: Mapping[str, object]) -> dict[str, object]:
+    return {key: value for key, value in measurement.items() if key != "transformed_text"}
+
+
+def run_fixture_compare(
+    encoder: Callable[[str], tuple[int, ...]] | None = None,
+    *,
+    arm_ids: Sequence[str] = CYCLE8_FIXTURE_ARM_IDS,
+) -> dict[str, object]:
+    rows = []
+    visible_pass = 0
+    visible_total = 0
+    for sample_id, text in cycle8_fixture_samples():
+        arms = {}
+        for arm_id in arm_ids:
+            measurement = measure_carrier_arm(
+                arm_id=arm_id,
+                source_sample_id=sample_id,
+                source_text=text,
+                encoder=encoder,
+            )
+            arms[arm_id] = summarize_arm(measurement)
+            visible_total += 1
+            if measurement["visible_ok"] is True:
+                visible_pass += 1
+        rows.append(
+            {
+                "source_sample_id": sample_id,
+                "source_text_hash": sha256_text(text),
+                "arms": arms,
+            }
+        )
+    payload = {
+        "algorithm_version": CYCLE8_FIXTURE_COMPARE_VERSION,
+        "arm_ids": tuple(arm_ids),
+        "encoder": "unavailable" if encoder is None else "gpt2",
+        "visible_pass_count": visible_pass,
+        "visible_total_count": visible_total,
+        "visible_pass_rate": f"{visible_pass}/{visible_total}",
+        "rows": tuple(rows),
+    }
+    return {**payload, "artifact_hash": sha256_json(payload)}
diff --git a/fuckmark/cycle8/decision.py b/fuckmark/cycle8/decision.py
new file mode 100644
index 00000000..c8239bb3
--- /dev/null
+++ b/fuckmark/cycle8/decision.py
@@ -0,0 +1,146 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+
+from .compare import (
+    CYCLE8_IDENTITY_ARM_ID,
+    CYCLE8_U034F_SPACE_ARM_ID,
+    CYCLE8_U034F_SPACE_RUN_ARM_ID,
+    CYCLE8_U200C_SPACE_ARM_ID,
+    CYCLE8_UFE00_SPACE_ARM_ID,
+)
+from .scoreboard import EvidenceLabel, ProductGate
+
+
+CYCLE8_DECISION_VERSION = "cycle8-fixture-decision-v1"
+PROMISING_DEVELOPMENT = "PROMISING_DEVELOPMENT"
+INSUFFICIENT_EVIDENCE = "INSUFFICIENT_EVIDENCE"
+REJECTED = "REJECTED"
+
+
+def _arm(row: Mapping[str, object], arm_id: str) -> Mapping[str, object]:
+    arms = row["arms"]
+    if not isinstance(arms, Mapping):
+        raise TypeError("row arms must be a mapping")
+    value = arms[arm_id]
+    if not isinstance(value, Mapping):
+        raise TypeError("arm summary must be a mapping")
+    return value
+
+
+def _sanitizer(arm: Mapping[str, object], variant: str) -> Mapping[str, object]:
+    sanitizers = arm["sanitizers"]
+    if not isinstance(sanitizers, Mapping):
+        raise TypeError("arm sanitizers must be a mapping")
+    value = sanitizers[variant]
+    if not isinstance(value, Mapping):
+        raise TypeError("sanitizer summary must be a mapping")
+    return value
+
+
+def classify_fixture_compare(report: Mapping[str, object]) -> dict[str, object]:
+    rows = report.get("rows")
+    if not isinstance(rows, (list, tuple)) or not rows:
+        raise ValueError("Cycle 8 fixture report must contain rows")
+    reasons: list[str] = []
+    visible_failures = 0
+    for row in rows:
+        if not isinstance(row, Mapping):
+            raise TypeError("fixture row must be a mapping")
+        arms = row["arms"]
+        if not isinstance(arms, Mapping):
+            raise TypeError("row arms must be a mapping")
+        for arm_id, arm in arms.items():
+            if not isinstance(arm, Mapping):
+                raise TypeError("arm summary must be a mapping")
+            if arm.get("visible_ok") is not True:
+                visible_failures += 1
+                reasons.append(f"{row.get('source_sample_id')}:{arm_id} failed visible projection")
+    screen = next(row for row in rows if row["source_sample_id"] == "gpt2-screen")
+    quote = next(row for row in rows if row["source_sample_id"] == "quote-interior")
+    identity = _arm(screen, CYCLE8_IDENTITY_ARM_ID)
+    u200c = _arm(screen, CYCLE8_U200C_SPACE_ARM_ID)
+    u034f = _arm(screen, CYCLE8_U034F_SPACE_ARM_ID)
+    u034f_run = _arm(screen, CYCLE8_U034F_SPACE_RUN_ARM_ID)
+    ufe00 = _arm(screen, CYCLE8_UFE00_SPACE_ARM_ID) if CYCLE8_UFE00_SPACE_ARM_ID in screen["arms"] else None
+    if identity.get("selected_count") != 0:
+        reasons.append("identity arm selected a transform")
+    if int(u034f["selected_count"]) <= 0:
+        reasons.append("U+034F space arm selected no sites on the GPT-2 fixture")
+    if _sanitizer(u200c, "cf_strip")["equals_source"] is True:
+        reasons.append("U+200C is removed by Cf-strip")
+    else:
+        reasons.append("U+200C unexpectedly survived Cf-strip")
+    if _sanitizer(u034f, "cf_strip")["equals_transformed"] is True:
+        reasons.append("U+034F survives Cf-strip on the GPT-2 fixture")
+    else:
+        reasons.append("U+034F did not survive Cf-strip")
+    if _sanitizer(u034f, "nfkc")["equals_transformed"] is True:
+        reasons.append("U+034F survives NFKC on the GPT-2 fixture")
+    if _sanitizer(u034f, "ws_collapse")["equals_transformed"] is True:
+        reasons.append("U+034F survives whitespace-collapse-v1 after ASCII spaces")
+    if int(_arm(quote, CYCLE8_U034F_SPACE_ARM_ID)["protected_blocked_count"]) > 0:
+        reasons.append("quote interiors block U+034F space carriers as protected spans")
+    tokenizer = u034f.get("tokenizer")
+    if isinstance(tokenizer, Mapping) and tokenizer.get("ids_equal") is False:
+        reasons.append("U+034F space insertion changes GPT-2 token ids")
+    if isinstance(tokenizer, Mapping) and int(u034f_run.get("utf8_overhead") or 0) > int(u034f.get("utf8_overhead") or 0):
+        reasons.append("U+034F x8 increases hidden payload over x1")
+    if ufe00 is not None and _sanitizer(ufe00, "cf_strip").get("equals_transformed") is True:
+        reasons.append("U+FE00 survives Cf-strip on the GPT-2 fixture")
+    product_gate = ProductGate.DISQUALIFIED if visible_failures else ProductGate.PASS
+    detector = report.get("detector")
+    detector_signal = None
+    if visible_failures:
+        decision = REJECTED
+        label = EvidenceLabel.PRODUCT_DISQUALIFIED
+    elif _sanitizer(u034f, "cf_strip")["equals_transformed"] is not True:
+        decision = REJECTED
+        label = EvidenceLabel.REJECTED
+    elif isinstance(detector, Mapping) and detector.get("available") is True:
+        u034f_summary = detector[CYCLE8_U034F_SPACE_ARM_ID]
+        identity_summary = detector[CYCLE8_IDENTITY_ARM_ID]
+        u200c_summary = detector[CYCLE8_U200C_SPACE_ARM_ID]
+        run_summary = detector[CYCLE8_U034F_SPACE_RUN_ARM_ID]
+        detector_signal = {
+            "identity_raw_watermarked_detected": int(identity_summary["raw_watermarked_detected"]),
+            "u200c_raw_watermarked_detected": int(u200c_summary["raw_watermarked_detected"]),
+            "u034f_raw_watermarked_detected": int(u034f_summary["raw_watermarked_detected"]),
+            "u034f_run_raw_watermarked_detected": int(run_summary["raw_watermarked_detected"]),
+            "u034f_ws_collapse_watermarked_detected": int(u034f_summary["ws_collapse_watermarked_detected"]),
+            "identity_raw_unwatermarked_detected": int(identity_summary["raw_unwatermarked_detected"]),
+            "u034f_raw_unwatermarked_detected": int(u034f_summary["raw_unwatermarked_detected"]),
+            "watermarked_row_count": int(u034f_summary["watermarked_row_count"]),
+        }
+        reasons.append("detector scores are development-only")
+        if (
+            product_gate is ProductGate.PASS
+            and int(u034f_summary["raw_watermarked_detected"]) < int(identity_summary["raw_watermarked_detected"])
+            and int(u034f_summary["raw_unwatermarked_detected"]) <= int(identity_summary["raw_unwatermarked_detected"])
+        ):
+            decision = PROMISING_DEVELOPMENT
+            label = EvidenceLabel.HYPOTHESIS
+            reasons.append("U+034F reduced raw watermarked detections without raising unwatermarked detections")
+        else:
+            decision = INSUFFICIENT_EVIDENCE
+            label = EvidenceLabel.HYPOTHESIS
+            reasons.append("U+034F did not beat identity on this tiny development corpus")
+    else:
+        decision = INSUFFICIENT_EVIDENCE
+        label = EvidenceLabel.HYPOTHESIS
+        reasons.append("no Cycle 8 detector scores on seed 890000 in this fixture artifact")
+    payload = {
+        "algorithm_version": CYCLE8_DECISION_VERSION,
+        "decision": decision,
+        "product_gate": product_gate.value,
+        "evidence_label": label.value,
+        "visible_failures": visible_failures,
+        "reasons": tuple(reasons),
+        "detector_signal": detector_signal,
+        "notes": (
+            "This is Cycle 8 development classification, not confirmation. "
+            "Do not inspect 830000, 840000, 850000, or Cycle 7 reserved 880000. "
+            "U+034F is not product-authorized."
+        ),
+    }
+    return payload
diff --git a/fuckmark/cycle8/ledger.py b/fuckmark/cycle8/ledger.py
new file mode 100644
index 00000000..92a552d1
--- /dev/null
+++ b/fuckmark/cycle8/ledger.py
@@ -0,0 +1,114 @@
+from __future__ import annotations
+
+from collections.abc import Mapping, Sequence
+
+from .._validation import require_int
+from ..hashing import sha256_json
+
+
+CYCLE8_LEDGER_VERSION = "cycle8-seed-ledger-v1"
+CYCLE8_EXPLORATORY_ROLE = "exploratory_development"
+CYCLE8_REPLICATION_ROLE = "exploratory_replication"
+CYCLE8_VALIDATION_ROLE = "validation_development"
+CYCLE8_CONFIRMATION_RESERVED_ROLE = "confirmation_reserved"
+
+CYCLE8_EXPLORATORY_SEED_BASE = 890_000
+CYCLE8_REPLICATION_SEED_BASE = 900_000
+CYCLE8_VALIDATION_SEED_BASE = 910_000
+CYCLE8_SECONDARY_EXPLORATORY_SEED_BASE = 920_000
+CYCLE8_EXPLORATORY_SEED_BASES = (890_000, 920_000)
+CYCLE8_REPLICATION_SEED_BASES = (900_000,)
+CYCLE8_VALIDATION_SEED_BASES = (910_000,)
+CYCLE8_CONFIRMATION_RESERVED_SEED_BASES = (830_000, 840_000, 850_000)
+CYCLE8_EXPLORATORY_TOPIC = "invisible carrier development"
+CYCLE8_REPLICATION_TOPIC = "invisible carrier replication"
+CYCLE8_VALIDATION_TOPIC = "invisible carrier validation"
+
+INHERITED_SPENT_SEED_BASES = (
+    760_000,
+    770_000,
+    780_000,
+    720_000,
+    730_000,
+    401_000,
+    402_000,
+    500_000,
+    61000,
+    1_120_000,
+    1_130_000,
+    1_140_000,
+    1_150_000,
+    1_160_000,
+    810_000,
+    820_000,
+    860_000,
+    870_000,
+)
+CYCLE7_UNSEEN_VALIDATION_SEED_BASE = 880_000
+
+_ALL_BLOCKED = frozenset((*INHERITED_SPENT_SEED_BASES, CYCLE7_UNSEEN_VALIDATION_SEED_BASE))
+
+
+def cycle8_seed_ledger_payload() -> dict[str, object]:
+    return {
+        "algorithm_version": CYCLE8_LEDGER_VERSION,
+        "generation": "cycle8_exact_visible_projection",
+        "inherited_spent_seed_bases": list(INHERITED_SPENT_SEED_BASES),
+        "cycle7_unseen_validation_seed_base": CYCLE7_UNSEEN_VALIDATION_SEED_BASE,
+        "exploratory_development_seed_base": CYCLE8_EXPLORATORY_SEED_BASE,
+        "exploratory_development_seed_bases": list(CYCLE8_EXPLORATORY_SEED_BASES),
+        "exploratory_topic": CYCLE8_EXPLORATORY_TOPIC,
+        "exploratory_replication_seed_base": CYCLE8_REPLICATION_SEED_BASE,
+        "exploratory_replication_topic": CYCLE8_REPLICATION_TOPIC,
+        "validation_development_seed_base": CYCLE8_VALIDATION_SEED_BASE,
+        "validation_topic": CYCLE8_VALIDATION_TOPIC,
+        "secondary_exploratory_seed_base": CYCLE8_SECONDARY_EXPLORATORY_SEED_BASE,
+        "confirmation_reserved_seed_bases": list(CYCLE8_CONFIRMATION_RESERVED_SEED_BASES),
+        "selection_rule": (
+            "Cycle 8 seeds 890000, 900000, 910000, and 920000 were assigned before "
+            "any Cycle 8 text generation or detector look. Do not inspect 830000, "
+            "840000, or 850000. Do not inspect Cycle 7 reserved validation seed "
+            "880000 from Cycle 8. Do not retune on Cycle 6 formal residuals."
+        ),
+    }
+
+
+def cycle8_seed_ledger_hash() -> str:
+    return sha256_json(cycle8_seed_ledger_payload())
+
+
+def role_for_seed_base(seed_base: int) -> str | None:
+    require_int("seed_base", seed_base)
+    if seed_base in CYCLE8_EXPLORATORY_SEED_BASES:
+        return CYCLE8_EXPLORATORY_ROLE
+    if seed_base in CYCLE8_REPLICATION_SEED_BASES:
+        return CYCLE8_REPLICATION_ROLE
+    if seed_base in CYCLE8_VALIDATION_SEED_BASES:
+        return CYCLE8_VALIDATION_ROLE
+    if seed_base in CYCLE8_CONFIRMATION_RESERVED_SEED_BASES:
+        return CYCLE8_CONFIRMATION_RESERVED_ROLE
+    return None
+
+
+def assert_cycle8_development_seed(seed_base: int, *, role: str) -> None:
+    require_int("seed_base", seed_base)
+    if not isinstance(role, str) or not role:
+        raise ValueError("role must be a non-empty string")
+    if seed_base in _ALL_BLOCKED:
+        raise ValueError("seed_base is spent or reserved outside Cycle 8 development")
+    if seed_base in CYCLE8_CONFIRMATION_RESERVED_SEED_BASES:
+        raise ValueError("confirmation-reserved seeds must not be used for Cycle 8 development")
+    expected = role_for_seed_base(seed_base)
+    if expected is None:
+        raise ValueError("seed_base is not in the Cycle 8 ledger")
+    if role != expected:
+        raise ValueError("seed_base role does not match the Cycle 8 ledger")
+
+
+def ledger_roles() -> Mapping[str, Sequence[int]]:
+    return {
+        CYCLE8_EXPLORATORY_ROLE: CYCLE8_EXPLORATORY_SEED_BASES,
+        CYCLE8_REPLICATION_ROLE: CYCLE8_REPLICATION_SEED_BASES,
+        CYCLE8_VALIDATION_ROLE: CYCLE8_VALIDATION_SEED_BASES,
+        CYCLE8_CONFIRMATION_RESERVED_ROLE: CYCLE8_CONFIRMATION_RESERVED_SEED_BASES,
+    }
diff --git a/fuckmark/cycle8/registry.py b/fuckmark/cycle8/registry.py
new file mode 100644
index 00000000..bf26d587
--- /dev/null
+++ b/fuckmark/cycle8/registry.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from ..product.carriers import InvisibleCarrierAfterAsciiLetterRule, space_carrier_rule
+from ..product.registry import ProductTransformRegistry
+from ..transforms.schema import TransformFamily
+
+
+def cycle8_space_carrier_registry(
+    codepoint: int,
+    identifiers: Sequence[str] = (),
+    *,
+    repeats: int = 1,
+) -> ProductTransformRegistry:
+    return ProductTransformRegistry(
+        (space_carrier_rule(codepoint, repeats),),
+        identifiers,
+        approved_carriers=(codepoint,),
+    )
+
+
+def cycle8_letter_carrier_registry(codepoint: int, identifiers: Sequence[str] = ()) -> ProductTransformRegistry:
+    return ProductTransformRegistry(
+        (InvisibleCarrierAfterAsciiLetterRule.create(codepoint),),
+        identifiers,
+        approved_carriers=(codepoint,),
+    )
+
+
+def cycle8_combined_carrier_registry(codepoint: int, identifiers: Sequence[str] = ()) -> ProductTransformRegistry:
+    return ProductTransformRegistry(
+        (space_carrier_rule(codepoint), InvisibleCarrierAfterAsciiLetterRule.create(codepoint)),
+        identifiers,
+        approved_carriers=(codepoint,),
+    )
+
+
+def select_nonoverlapping_candidate_ids(enumeration) -> tuple[str, ...]:
+    selected: list[str] = []
+    occupied_until = 0
+    for candidate in enumeration.candidates:
+        if candidate.start < occupied_until:
+            continue
+        if candidate.family is not TransformFamily.ORTHOGRAPHY:
+            continue
+        selected.append(candidate.candidate_id)
+        occupied_until = candidate.end
+    return tuple(selected)
+
+
+def apply_all_candidates(registry: ProductTransformRegistry, text: str) -> str:
+    enumeration = registry.enumerate(text)
+    selected = select_nonoverlapping_candidate_ids(enumeration)
+    if not selected:
+        return text
+    return registry.apply(enumeration, selected).output_text
diff --git a/fuckmark/cycle8/scoreboard.py b/fuckmark/cycle8/scoreboard.py
new file mode 100644
index 00000000..00d259dd
--- /dev/null
+++ b/fuckmark/cycle8/scoreboard.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from enum import Enum
+
+from ..hashing import sha256_json
+
+
+class EvidenceLabel(str, Enum):
+    VERIFIED = "VERIFIED"
+    SOURCE_BOUND = "SOURCE-BOUND"
+    HYPOTHESIS = "HYPOTHESIS"
+    UNKNOWN = "UNKNOWN"
+    REJECTED = "REJECTED"
+    PRODUCT_DISQUALIFIED = "PRODUCT_DISQUALIFIED"
+    HISTORICAL_ONLY = "HISTORICAL_ONLY"
+    EXTERNAL_VALIDATION_ONLY = "EXTERNAL-VALIDATION-ONLY"
+
+
+class ProductGate(str, Enum):
+    PASS = "VISIBLE_INVARIANT_PASS"
+    FAIL = "VISIBLE_INVARIANT_FAIL"
+    DISQUALIFIED = "PRODUCT_DISQUALIFIED"
+
+
+CYCLE8_SCOREBOARD_VERSION = "cycle8-product-scoreboard-v1"
+
+
+def product_scoreboard_payload(
+    *,
+    mechanism_id: str,
+    visible_pass_rate: str,
+    carrier_type: str,
+    inserted_count: int,
+    utf8_overhead: int,
+    sanitizer: dict[str, object],
+    tokenizer: dict[str, object] | None,
+    detector: dict[str, object] | None,
+    product_gate: ProductGate,
+    label: EvidenceLabel,
+) -> dict[str, object]:
+    payload = {
+        "algorithm_version": CYCLE8_SCOREBOARD_VERSION,
+        "mechanism_id": mechanism_id,
+        "visible_contract": {"projection_pass_rate": visible_pass_rate},
+        "carrier": {
+            "type": carrier_type,
+            "inserted_count": inserted_count,
+            "utf8_overhead": utf8_overhead,
+        },
+        "sanitizer": sanitizer,
+        "tokenizer": tokenizer,
+        "detector": detector,
+        "product_gate": product_gate.value,
+        "evidence_label": label.value,
+    }
+    payload["scoreboard_hash"] = sha256_json(payload)
+    return payload
diff --git a/fuckmark/cycle8/tokenizer_screen.py b/fuckmark/cycle8/tokenizer_screen.py
new file mode 100644
index 00000000..1dc34d3f
--- /dev/null
+++ b/fuckmark/cycle8/tokenizer_screen.py
@@ -0,0 +1,134 @@
+from __future__ import annotations
+
+from collections.abc import Callable, Sequence
+
+from ..hashing import sha256_json
+from ..product.visible_projection import is_carrier_insertion_v1
+
+
+TOKENIZER_SCREEN_VERSION = "cycle8-tokenizer-screen-v1"
+GPT2_FIXTURE = "The researchers cannot continue until they do not miss the proof of concept."
+
+
+def load_gpt2_encoder() -> Callable[[str], tuple[int, ...]] | None:
+    try:
+        import tiktoken
+    except ImportError:
+        return None
+    encoding = tiktoken.get_encoding("gpt2")
+
+    def encode(text: str) -> tuple[int, ...]:
+        if not isinstance(text, str):
+            raise TypeError("text must be a string")
+        return tuple(encoding.encode(text, disallowed_special=()) )
+
+    return encode
+
+
+def require_gpt2_encoder() -> Callable[[str], tuple[int, ...]]:
+    encoder = load_gpt2_encoder()
+    if encoder is None:
+        raise RuntimeError("gpt2 encoder is required to write Cycle 8 tokenizer artifacts")
+    return encoder
+
+
+def resynchronization_metrics(original_ids: Sequence[int], transformed_ids: Sequence[int]) -> dict[str, object]:
+    original = tuple(original_ids)
+    transformed = tuple(transformed_ids)
+    first = None
+    last = None
+    limit = min(len(original), len(transformed))
+    for index in range(limit):
+        if original[index] != transformed[index]:
+            if first is None:
+                first = index
+            last = index
+    if first is None and len(original) != len(transformed):
+        first = limit
+        last = max(len(original), len(transformed)) - 1
+    changed = 0
+    if first is not None:
+        changed = abs(len(transformed) - len(original))
+        changed += sum(
+            1 for index in range(limit) if original[index] != transformed[index]
+        )
+    suffix_align = 0
+    original_index = len(original) - 1
+    transformed_index = len(transformed) - 1
+    while original_index >= 0 and transformed_index >= 0 and original[original_index] == transformed[transformed_index]:
+        suffix_align += 1
+        original_index -= 1
+        transformed_index -= 1
+    return {
+        "original_token_count": len(original),
+        "transformed_token_count": len(transformed),
+        "token_count_delta": len(transformed) - len(original),
+        "first_changed_token": first,
+        "last_changed_token": last,
+        "changed_token_estimate": changed,
+        "suffix_alignment_tokens": suffix_align,
+        "ids_equal": original == transformed,
+    }
+
+
+def insert_after_ascii_spaces(text: str, carrier: str, repeats: int = 1) -> str:
+    if not isinstance(text, str) or not isinstance(carrier, str):
+        raise TypeError("text and carrier must be strings")
+    if not isinstance(repeats, int) or isinstance(repeats, bool) or repeats <= 0:
+        raise ValueError("repeats must be a positive integer")
+    payload = carrier * repeats
+    pieces: list[str] = []
+    for index, character in enumerate(text):
+        pieces.append(character)
+        if character == " " and 0 < index < len(text) - 1 and text[index - 1].isascii() and text[index - 1].isalpha() and text[index + 1].isascii() and text[index + 1].isalpha():
+            pieces.append(payload)
+    return "".join(pieces)
+
+
+def insert_after_ascii_letters(text: str, carrier: str) -> str:
+    if not isinstance(text, str) or not isinstance(carrier, str):
+        raise TypeError("text and carrier must be strings")
+    return "".join(character + carrier if character.isascii() and character.isalpha() else character for character in text)
+
+
+def screen_carrier_tokenizer(
+    codepoint: int,
+    *,
+    encoder: Callable[[str], tuple[int, ...]] | None = None,
+    fixture: str = GPT2_FIXTURE,
+) -> dict[str, object]:
+    if encoder is None:
+        encoder = load_gpt2_encoder()
+    carrier = chr(codepoint)
+    space_text = insert_after_ascii_spaces(fixture, carrier)
+    space_run_text = insert_after_ascii_spaces(fixture, carrier, repeats=8)
+    letter_text = insert_after_ascii_letters(fixture, carrier)
+    payload: dict[str, object] = {
+        "algorithm_version": TOKENIZER_SCREEN_VERSION,
+        "codepoint": codepoint,
+        "label": f"U+{codepoint:04X}",
+        "fixture": fixture,
+        "space_visible_ok": is_carrier_insertion_v1(fixture, space_text, (codepoint,)),
+        "space_run_visible_ok": is_carrier_insertion_v1(fixture, space_run_text, (codepoint,)),
+        "letter_visible_ok": is_carrier_insertion_v1(fixture, letter_text, (codepoint,)),
+        "space_inserted": space_text.count(carrier),
+        "space_run_inserted": space_run_text.count(carrier),
+        "letter_inserted": letter_text.count(carrier),
+        "space_utf8_overhead": len(space_text.encode("utf-8")) - len(fixture.encode("utf-8")),
+        "space_run_utf8_overhead": len(space_run_text.encode("utf-8")) - len(fixture.encode("utf-8")),
+        "letter_utf8_overhead": len(letter_text.encode("utf-8")) - len(fixture.encode("utf-8")),
+        "encoder": "unavailable" if encoder is None else "gpt2",
+    }
+    if encoder is None:
+        payload["space_metrics"] = None
+        payload["space_run_metrics"] = None
+        payload["letter_metrics"] = None
+        payload["status"] = "UNKNOWN"
+        return payload
+    original_ids = encoder(fixture)
+    payload["space_metrics"] = resynchronization_metrics(original_ids, encoder(space_text))
+    payload["space_run_metrics"] = resynchronization_metrics(original_ids, encoder(space_run_text))
+    payload["letter_metrics"] = resynchronization_metrics(original_ids, encoder(letter_text))
+    payload["status"] = "VERIFIED"
+    payload["evidence_hash"] = sha256_json(payload)
+    return payload
diff --git a/fuckmark/cycle8/unicode_meta.py b/fuckmark/cycle8/unicode_meta.py
new file mode 100644
index 00000000..ed932d23
--- /dev/null
+++ b/fuckmark/cycle8/unicode_meta.py
@@ -0,0 +1,153 @@
+from __future__ import annotations
+
+import unicodedata
+from collections.abc import Iterable
+
+from ..cycle7.whitespace_collapse import collapse_horizontal_ascii_whitespace
+from ..sanitizer_robustness import nfkc_normalize, strip_unicode_format_characters
+
+
+UNICODE_PROPERTY_SCAN_VERSION = "cycle8-unicode-property-scan-v1"
+
+DEFAULT_IGNORABLE_RANGES_V1 = (
+    (0x00AD, 0x00AD),
+    (0x034F, 0x034F),
+    (0x061C, 0x061C),
+    (0x115F, 0x1160),
+    (0x17B4, 0x17B5),
+    (0x180B, 0x180F),
+    (0x200B, 0x200F),
+    (0x202A, 0x202E),
+    (0x2060, 0x206F),
+    (0x3164, 0x3164),
+    (0xFE00, 0xFE0F),
+    (0xFEFF, 0xFEFF),
+    (0xFFA0, 0xFFA0),
+    (0xFFF0, 0xFFF8),
+    (0x1BCA0, 0x1BCA3),
+    (0x1D173, 0x1D17A),
+    (0xE0000, 0xE0FFF),
+)
+
+_BIDI_OVERRIDE = frozenset({"RLE", "LRE", "RLO", "LRO", "RLI", "LRI", "FSI", "PDF", "PDI"})
+_VISIBLE_CATEGORIES = frozenset(
+    {
+        "Lu",
+        "Ll",
+        "Lt",
+        "Lm",
+        "Lo",
+        "Nd",
+        "Nl",
+        "No",
+        "Pc",
+        "Pd",
+        "Ps",
+        "Pe",
+        "Pi",
+        "Pf",
+        "Po",
+        "Sm",
+        "Sc",
+        "Sk",
+        "So",
+        "Zs",
+        "Zl",
+        "Zp",
+        "Mc",
+    }
+)
+
+
+def is_default_ignorable_v1(codepoint: int) -> bool:
+    if not isinstance(codepoint, int) or isinstance(codepoint, bool):
+        raise TypeError("codepoint must be an integer")
+    return any(start <= codepoint <= end for start, end in DEFAULT_IGNORABLE_RANGES_V1)
+
+
+def iter_default_ignorable_codepoints_v1() -> tuple[int, ...]:
+    values: list[int] = []
+    for start, end in DEFAULT_IGNORABLE_RANGES_V1:
+        values.extend(range(start, end + 1))
+    return tuple(value for value in values if 0 <= value <= 0x10FFFF and not (0xD800 <= value <= 0xDFFF))
+
+
+def codepoint_properties(codepoint: int) -> dict[str, object]:
+    if not isinstance(codepoint, int) or isinstance(codepoint, bool):
+        raise TypeError("codepoint must be an integer")
+    if codepoint < 0 or codepoint > 0x10FFFF or 0xD800 <= codepoint <= 0xDFFF:
+        raise ValueError("codepoint must be a Unicode scalar value")
+    character = chr(codepoint)
+    try:
+        name = unicodedata.name(character)
+    except ValueError:
+        name = ""
+    category = unicodedata.category(character)
+    combining = unicodedata.combining(character)
+    bidirectional = unicodedata.bidirectional(character)
+    east_asian_width = unicodedata.east_asian_width(character)
+    nfc = unicodedata.normalize("NFC", character)
+    nfd = unicodedata.normalize("NFD", character)
+    nfkc = unicodedata.normalize("NFKC", character)
+    nfkd = unicodedata.normalize("NFKD", character)
+    utf8 = character.encode("utf-8")
+    cf_stripped = strip_unicode_format_characters(character)
+    collapsed = collapse_horizontal_ascii_whitespace(f"A{character}B")
+    combined = collapse_horizontal_ascii_whitespace(
+        strip_unicode_format_characters(nfkc_normalize(f"A{character}B"))
+    )
+    return {
+        "codepoint": codepoint,
+        "label": f"U+{codepoint:04X}",
+        "name": name,
+        "category": category,
+        "combining_class": combining,
+        "bidirectional_class": bidirectional,
+        "east_asian_width": east_asian_width,
+        "default_ignorable": is_default_ignorable_v1(codepoint),
+        "nfc": nfc,
+        "nfd": nfd,
+        "nfkc": nfkc,
+        "nfkd": nfkd,
+        "nfc_stable": nfc == character,
+        "nfd_stable": nfd == character,
+        "nfkc_stable": nfkc == character,
+        "nfkd_stable": nfkd == character,
+        "cf_strip_survives": cf_stripped == character,
+        "whitespace_collapse_survives": collapsed == f"A{character}B",
+        "combined_ws_nfkc_cf_survives": combined == f"A{character}B",
+        "utf8_byte_length": len(utf8),
+        "assigned": bool(name),
+        "bidi_override": bidirectional in _BIDI_OVERRIDE,
+        "visible_category": category in _VISIBLE_CATEGORIES,
+        "control_category": category in {"Cc", "Cs"},
+        "format_category": category == "Cf",
+        "nonspacing_mark": category == "Mn",
+    }
+
+
+def classify_carrier_hypothesis(properties: dict[str, object]) -> str:
+    if properties["control_category"] or properties["bidi_override"] or properties["visible_category"]:
+        return "REJECTED_RENDERING_OR_CONTROL_RISK"
+    if not properties["assigned"]:
+        return "REJECTED_UNASSIGNED"
+    if properties["format_category"]:
+        return "DIAGNOSTIC_CF"
+    if not properties["default_ignorable"]:
+        return "REJECTED_NOT_DEFAULT_IGNORABLE"
+    if not properties["nfkc_stable"] or not properties["nfc_stable"]:
+        return "REJECTED_NORMALIZATION"
+    if not properties["whitespace_collapse_survives"]:
+        return "REJECTED_WHITESPACE_COLLAPSE"
+    if properties["nonspacing_mark"] and properties["cf_strip_survives"] and properties["combined_ws_nfkc_cf_survives"]:
+        return "DURABLE_TRACK_CANDIDATE"
+    return "HYPOTHESIS"
+
+
+def audit_codepoints(codepoints: Iterable[int]) -> tuple[dict[str, object], ...]:
+    rows = []
+    for codepoint in codepoints:
+        properties = codepoint_properties(codepoint)
+        properties["classification"] = classify_carrier_hypothesis(properties)
+        rows.append(properties)
+    return tuple(rows)
diff --git a/fuckmark/cycle8_hf.py b/fuckmark/cycle8_hf.py
new file mode 100644
index 00000000..eb04ee28
--- /dev/null
+++ b/fuckmark/cycle8_hf.py
@@ -0,0 +1,355 @@
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+from typing import Any
+
+from .config import canonical_json_text
+from .corpus.schema import CorpusDomain, WatermarkLabel
+from .corpus.tiny_dev import TINY_DEV_TARGET_LENGTH
+from .corpus.tiny_dev_generation import TINY_DEV_PAIR_SEED_STRIDE
+from .cycle7.whitespace_collapse import CYCLE7_SANITIZER_VARIANT_IDS, sanitize_cycle7_variant
+from .cycle8.compare import (
+    CYCLE8_DETECTOR_ARM_IDS,
+    CYCLE8_MAX_ATTEMPTS,
+    measure_carrier_arm,
+    summarize_arm,
+)
+from .cycle8.decision import classify_fixture_compare
+from .cycle8.ledger import (
+    CYCLE8_EXPLORATORY_ROLE,
+    CYCLE8_EXPLORATORY_SEED_BASE,
+    CYCLE8_EXPLORATORY_TOPIC,
+    CYCLE8_REPLICATION_ROLE,
+    CYCLE8_REPLICATION_TOPIC,
+    CYCLE8_VALIDATION_ROLE,
+    CYCLE8_VALIDATION_TOPIC,
+    assert_cycle8_development_seed,
+    role_for_seed_base,
+)
+from .durable_io import write_canonical_json_fsynced
+from .experiments.cycle6_confirmation import CYCLE6_THRESHOLD
+from .hashing import sha256_json, sha256_text
+from .product.domain import is_supported_product_domain_v1
+
+
+CYCLE8_DETECTOR_VERSION = "cycle8-exploratory-detector-compare-v1"
+_CYCLE8_TEMPLATES = {
+    CorpusDomain.GENERAL_EXPLANATORY: (
+        "Explain in plain English why {topic} matters in careful scientific work. "
+        "Write one coherent paragraph without a list."
+    ),
+    CorpusDomain.TECHNICAL_EXPLANATION: (
+        "Give a technical explanation of {topic} in software experiments. "
+        "Define the main idea, one failure mode, and one validation check."
+    ),
+    CorpusDomain.CONVERSATIONAL_PROSE: (
+        "Answer a colleague who asks why {topic} matters. "
+        "Use natural conversational prose while keeping the explanation precise."
+    ),
+    CorpusDomain.STRUCTURED_INSTRUCTIONAL: (
+        "Write a short three-step instruction for applying {topic} in an experiment. "
+        "Use complete sentences and keep each step concrete."
+    ),
+}
+
+
+def _detector_arm_summary(rows: tuple[dict[str, object], ...], arm_id: str) -> dict[str, object]:
+    watermarked = tuple(
+        row for row in rows if row["label"] == WatermarkLabel.WATERMARKED.value and row["arm_id"] == arm_id
+    )
+    unwatermarked = tuple(
+        row for row in rows if row["label"] == WatermarkLabel.UNWATERMARKED.value and row["arm_id"] == arm_id
+    )
+
+    def _count(selected, variant, field):
+        return sum(bool(row["sanitizers"][variant][field]) for row in selected)
+
+    def _mean(selected, variant):
+        return sum(float(row["sanitizers"][variant]["score"]) for row in selected) / len(selected)
+
+    return {
+        "arm_id": arm_id,
+        "watermarked_row_count": len(watermarked),
+        "unwatermarked_row_count": len(unwatermarked),
+        "pristine_watermarked_detected": sum(bool(row["pristine_detected"]) for row in watermarked),
+        "pristine_unwatermarked_detected": sum(bool(row["pristine_detected"]) for row in unwatermarked),
+        "raw_watermarked_detected": _count(watermarked, "raw", "detected"),
+        "raw_unwatermarked_detected": _count(unwatermarked, "raw", "detected"),
+        "ws_collapse_watermarked_detected": _count(watermarked, "ws_collapse", "detected"),
+        "ws_collapse_unwatermarked_detected": _count(unwatermarked, "ws_collapse", "detected"),
+        "cf_strip_watermarked_detected": _count(watermarked, "cf_strip", "detected"),
+        "nfkc_watermarked_detected": _count(watermarked, "nfkc", "detected"),
+        "raw_watermarked_mean_score": _mean(watermarked, "raw"),
+        "ws_collapse_watermarked_mean_score": _mean(watermarked, "ws_collapse"),
+        "visible_pass_count": sum(bool(row["geometry"]["visible_ok"]) for row in (*watermarked, *unwatermarked)),
+        "visible_total_count": len(watermarked) + len(unwatermarked),
+    }
+
+
+def _topic_for_seed(seed_base: int) -> str:
+    role = role_for_seed_base(seed_base)
+    if role == CYCLE8_EXPLORATORY_ROLE:
+        return CYCLE8_EXPLORATORY_TOPIC
+    if role == CYCLE8_REPLICATION_ROLE:
+        return CYCLE8_REPLICATION_TOPIC
+    if role == CYCLE8_VALIDATION_ROLE:
+        return CYCLE8_VALIDATION_TOPIC
+    raise ValueError("Cycle 8 detector compare only runs exploratory, replication, or validation seeds")
+
+
+def _generate_cycle8_samples(backend: Any, seed_base: int, max_attempts: int) -> tuple[dict[str, object], ...]:
+    role = role_for_seed_base(seed_base)
+    if role is None:
+        raise ValueError("seed_base is not in the Cycle 8 ledger")
+    assert_cycle8_development_seed(seed_base, role=role)
+    topic = _topic_for_seed(seed_base)
+    samples: list[dict[str, object]] = []
+    for pair_index, domain in enumerate(CorpusDomain):
+        prompt = _CYCLE8_TEMPLATES[domain].format(topic=topic)
+        pair_seed_base = seed_base + pair_index * TINY_DEV_PAIR_SEED_STRIDE
+        accepted = None
+        for attempt in range(max_attempts):
+            seed = pair_seed_base + attempt
+            try:
+                control = backend.generate(prompt, seed, watermarked=False)
+                watermarked = backend.generate(prompt, seed, watermarked=True)
+            except RuntimeError as error:
+                message = str(error)
+                if "empty decoded continuation" not in message and "text-only re-encoding" not in message:
+                    raise
+                continue
+            if len(control.continuation_token_ids) != TINY_DEV_TARGET_LENGTH:
+                continue
+            if len(watermarked.continuation_token_ids) != TINY_DEV_TARGET_LENGTH:
+                continue
+            if control.text == watermarked.text:
+                continue
+            if not is_supported_product_domain_v1(control.text):
+                continue
+            if not is_supported_product_domain_v1(watermarked.text):
+                continue
+            accepted = (seed, control, watermarked)
+            break
+        if accepted is None:
+            raise RuntimeError(f"Cycle 8 failed to generate an ASCII pair for {domain.value}")
+        seed, control, watermarked = accepted
+        for label, generated in (
+            (WatermarkLabel.UNWATERMARKED, control),
+            (WatermarkLabel.WATERMARKED, watermarked),
+        ):
+            sample_id = f"cycle8-{seed_base}-{domain.value}-{label.value}"
+            samples.append(
+                {
+                    "sample_id": sample_id,
+                    "domain": domain.value,
+                    "label": label.value,
+                    "prompt": prompt,
+                    "seed": seed,
+                    "text": generated.text,
+                    "text_sha256": sha256_text(generated.text),
+                    "text_only_token_ids": generated.text_only_token_ids,
+                }
+            )
+    return tuple(samples)
+
+
+def _evaluate_samples(
+    samples: tuple[dict[str, object], ...],
+    tokenizer: Any,
+    adapter: Any,
+    eos: int,
+) -> tuple[tuple[dict[str, object], ...], tuple[dict[str, object], ...], dict[str, object]]:
+    from .cycle7_stage_a_hf import _score_text
+    from .tiny_dev_transform_hf import _encode_text
+
+    def encoder(text: str) -> tuple[int, ...]:
+        return _encode_text(tokenizer, text)
+
+    scored_rows: list[dict[str, object]] = []
+    geometry_rows: list[dict[str, object]] = []
+    for sample in samples:
+        measurements = {}
+        for arm_id in CYCLE8_DETECTOR_ARM_IDS:
+            measurements[arm_id] = measure_carrier_arm(
+                arm_id=arm_id,
+                source_sample_id=str(sample["sample_id"]),
+                source_text=str(sample["text"]),
+                encoder=encoder,
+            )
+        geometry_rows.append(
+            {
+                "sample_id": sample["sample_id"],
+                "label": sample["label"],
+                "domain": sample["domain"],
+                "arms": {arm_id: summarize_arm(measurement) for arm_id, measurement in measurements.items()},
+            }
+        )
+        pristine = _score_text(
+            f"{sample['sample_id']}-pristine",
+            str(sample["text"]),
+            tokenizer,
+            adapter,
+            eos,
+        )
+        for arm_id, measurement in measurements.items():
+            sanitizers = {}
+            for variant in CYCLE7_SANITIZER_VARIANT_IDS:
+                text = sanitize_cycle7_variant(variant, str(measurement["transformed_text"]))
+                score = _score_text(
+                    f"{sample['sample_id']}-{arm_id}-{variant}",
+                    text,
+                    tokenizer,
+                    adapter,
+                    eos,
+                )
+                sanitizers[variant] = {
+                    "text_hash": sha256_text(text),
+                    "score": score,
+                    "detected": score >= CYCLE6_THRESHOLD,
+                    "equals_source": text == str(sample["text"]),
+                }
+            scored_rows.append(
+                {
+                    "sample_id": sample["sample_id"],
+                    "label": sample["label"],
+                    "domain": sample["domain"],
+                    "arm_id": arm_id,
+                    "pristine_score": pristine,
+                    "pristine_detected": pristine >= CYCLE6_THRESHOLD,
+                    "geometry": summarize_arm(measurement),
+                    "sanitizers": sanitizers,
+                }
+            )
+    summaries = {
+        arm_id: _detector_arm_summary(tuple(scored_rows), arm_id) for arm_id in CYCLE8_DETECTOR_ARM_IDS
+    }
+    return tuple(geometry_rows), tuple(scored_rows), summaries
+
+
+def _build_detector_artifact(
+    samples: tuple[dict[str, object], ...],
+    geometry_rows: tuple[dict[str, object], ...],
+    scored_rows: tuple[dict[str, object], ...],
+    summaries: dict[str, object],
+    *,
+    seed_base: int,
+) -> dict[str, object]:
+    from .tiny_dev_context_survival_plan_hf import DEFAULT_MODEL_ID, DEFAULT_MODEL_REVISION
+
+    visible_pass = sum(int(summary["visible_pass_count"]) for summary in summaries.values())
+    visible_total = sum(int(summary["visible_total_count"]) for summary in summaries.values())
+    artifact = {
+        "algorithm_version": CYCLE8_DETECTOR_VERSION,
+        "seed_base": seed_base,
+        "topic": _topic_for_seed(seed_base),
+        "model": DEFAULT_MODEL_ID,
+        "model_revision": DEFAULT_MODEL_REVISION,
+        "threshold": CYCLE6_THRESHOLD,
+        "sanitizer_ids": CYCLE7_SANITIZER_VARIANT_IDS,
+        "arm_ids": CYCLE8_DETECTOR_ARM_IDS,
+        "visible_pass_rate": f"{visible_pass}/{visible_total}",
+        "samples": tuple(
+            {
+                "sample_id": sample["sample_id"],
+                "domain": sample["domain"],
+                "label": sample["label"],
+                "seed": sample["seed"],
+                "text": sample["text"],
+                "text_sha256": sample["text_sha256"],
+            }
+            for sample in samples
+        ),
+        "geometry_rows": geometry_rows,
+        "scored_rows": scored_rows,
+        "summaries": summaries,
+        "detector_access_used_for_selection": False,
+        "secret_access_used_for_selection": False,
+    }
+    return {**artifact, "artifact_hash": sha256_json({key: value for key, value in artifact.items() if key != "artifact_hash"})}
+
+
+def run_cycle8_detector_compare(
+    *,
+    device: str = "cpu",
+    max_attempts: int = CYCLE8_MAX_ATTEMPTS,
+    seed_base: int = CYCLE8_EXPLORATORY_SEED_BASE,
+) -> dict[str, object]:
+    from .cycle7_stage_a_hf import _adapter_and_tokenizer
+
+    role = role_for_seed_base(seed_base)
+    if role is None:
+        raise ValueError("seed_base is not in the Cycle 8 ledger")
+    assert_cycle8_development_seed(seed_base, role=role)
+    backend, tokenizer, adapter, _identity_hash, eos = _adapter_and_tokenizer(device)
+    samples = _generate_cycle8_samples(backend, seed_base, max_attempts)
+    geometry_rows, scored_rows, summaries = _evaluate_samples(samples, tokenizer, adapter, eos)
+    return _build_detector_artifact(samples, geometry_rows, scored_rows, summaries, seed_base=seed_base)
+
+
+def rescore_cycle8_detector_compare(previous: dict[str, object], *, device: str = "cpu") -> dict[str, object]:
+    from .cycle7_stage_a_hf import _adapter_and_tokenizer
+
+    seed_base = int(previous["seed_base"])
+    role = role_for_seed_base(seed_base)
+    if role is None:
+        raise ValueError("seed_base is not in the Cycle 8 ledger")
+    assert_cycle8_development_seed(seed_base, role=role)
+    _backend, tokenizer, adapter, _identity_hash, eos = _adapter_and_tokenizer(device)
+    samples = tuple(previous["samples"])
+    geometry_rows, scored_rows, summaries = _evaluate_samples(samples, tokenizer, adapter, eos)
+    return _build_detector_artifact(samples, geometry_rows, scored_rows, summaries, seed_base=seed_base)
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(prog="fuckmark-cycle8-detector")
+    parser.add_argument("--device", choices=("cpu", "cuda"), default="cpu")
+    parser.add_argument("--seed-base", type=int, default=CYCLE8_EXPLORATORY_SEED_BASE)
+    parser.add_argument("--max-attempts", type=int, default=CYCLE8_MAX_ATTEMPTS)
+    parser.add_argument(
+        "--detector-json",
+        type=Path,
+        default=None,
+    )
+    parser.add_argument("--skip-detector", action="store_true")
+    parser.add_argument("--rescore-from", type=Path, default=None)
+    args = parser.parse_args(argv)
+    from .cycle8.compare import run_fixture_compare
+    from .cycle8.tokenizer_screen import load_gpt2_encoder
+
+    if args.detector_json is None:
+        args.detector_json = Path(f"evidence/cycle8-{args.seed_base}-2026-08-25/detector-compare.json")
+    fixture = run_fixture_compare(encoder=load_gpt2_encoder())
+    args.detector_json.parent.mkdir(parents=True, exist_ok=True)
+    write_canonical_json_fsynced(args.detector_json.parent / "fixture-compare.json", fixture)
+    detector = None
+    if not args.skip_detector:
+        if args.rescore_from is not None:
+            import json
+
+            previous = json.loads(args.rescore_from.read_text(encoding="utf-8"))
+            detector = rescore_cycle8_detector_compare(previous, device=args.device)
+        else:
+            detector = run_cycle8_detector_compare(
+                device=args.device,
+                max_attempts=args.max_attempts,
+                seed_base=args.seed_base,
+            )
+        write_canonical_json_fsynced(args.detector_json, detector)
+        fixture = {
+            **{key: value for key, value in fixture.items() if key != "artifact_hash"},
+            "detector": {"available": True, **detector["summaries"]},
+        }
+        fixture = {
+            **fixture,
+            "artifact_hash": sha256_json({key: value for key, value in fixture.items() if key != "artifact_hash"}),
+        }
+        write_canonical_json_fsynced(args.detector_json.parent / "fixture-compare.json", fixture)
+    decision = classify_fixture_compare(fixture)
+    write_canonical_json_fsynced(args.detector_json.parent / "decision.json", decision)
+    print(canonical_json_text(decision))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/fuckmark/product/__init__.py b/fuckmark/product/__init__.py
new file mode 100644
index 00000000..3483c414
--- /dev/null
+++ b/fuckmark/product/__init__.py
@@ -0,0 +1,54 @@
+from .carriers import (
+    InvisibleCarrierAfterAsciiLetterRule,
+    codepoint_label,
+    rule_preserves_visible_projection,
+    space_carrier_rule,
+)
+from .contract import (
+    PRODUCT_CONTRACT_PATH,
+    load_product_contract,
+    product_contract_hash,
+    product_contract_payload,
+)
+from .domain import PRODUCT_DOMAIN_ID, is_supported_product_domain_v1
+from .invariants import (
+    USER_VISIBLE_INVARIANT_ALGORITHM_VERSION,
+    UserVisibleInvariantReason,
+    UserVisibleInvariantReport,
+    validate_user_visible_invariants,
+)
+from .registry import PRODUCT_REGISTRY_ALGORITHM_VERSION, ProductTransformRegistry, product_transform_registry
+from .visible_projection import (
+    PRODUCT_CONTRACT_ID,
+    VISIBLE_PROJECTION_ALGORITHM_VERSION,
+    is_carrier_insertion_v1,
+    normalize_approved_carriers,
+    product_approved_carriers_v1,
+    project_visible_v1,
+)
+
+__all__ = [
+    "InvisibleCarrierAfterAsciiLetterRule",
+    "PRODUCT_CONTRACT_ID",
+    "PRODUCT_CONTRACT_PATH",
+    "PRODUCT_DOMAIN_ID",
+    "PRODUCT_REGISTRY_ALGORITHM_VERSION",
+    "ProductTransformRegistry",
+    "USER_VISIBLE_INVARIANT_ALGORITHM_VERSION",
+    "UserVisibleInvariantReason",
+    "UserVisibleInvariantReport",
+    "VISIBLE_PROJECTION_ALGORITHM_VERSION",
+    "codepoint_label",
+    "is_carrier_insertion_v1",
+    "is_supported_product_domain_v1",
+    "load_product_contract",
+    "normalize_approved_carriers",
+    "product_approved_carriers_v1",
+    "product_contract_hash",
+    "product_contract_payload",
+    "product_transform_registry",
+    "project_visible_v1",
+    "rule_preserves_visible_projection",
+    "space_carrier_rule",
+    "validate_user_visible_invariants",
+]
diff --git a/fuckmark/product/carriers.py b/fuckmark/product/carriers.py
new file mode 100644
index 00000000..73287e2a
--- /dev/null
+++ b/fuckmark/product/carriers.py
@@ -0,0 +1,133 @@
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+
+from .._validation import require_bool, require_clean_string, require_int, require_sha256
+from ..hashing import sha256_json
+from ..transforms.rules import LiteralTransformRule, RULE_ALGORITHM_VERSION
+from ..transforms.schema import TransformFamily, TransformTier
+from .visible_projection import is_carrier_insertion_v1, normalize_approved_carriers
+
+
+INVISIBLE_CARRIER_RULE_ALGORITHM_VERSION = "invisible-carrier-rule-v1"
+INVISIBLE_LETTER_CARRIER_SENTINEL = "letter"
+
+
+def codepoint_label(codepoint: int) -> str:
+    require_int("codepoint", codepoint)
+    if codepoint < 0 or codepoint > 0x10FFFF:
+        raise ValueError("codepoint must be a Unicode scalar value")
+    return f"U+{codepoint:04X}"
+
+
+def space_carrier_rule(codepoint: int, repeats: int = 1) -> LiteralTransformRule:
+    require_int("codepoint", codepoint)
+    require_int("repeats", repeats)
+    if repeats <= 0:
+        raise ValueError("repeats must be positive")
+    carrier = chr(codepoint) * repeats
+    suffix = "" if repeats == 1 else f"-x{repeats}"
+    return LiteralTransformRule.create(
+        rule_id=f"product-carrier-space-{codepoint:04X}{suffix}",
+        version="v1",
+        family=TransformFamily.ORTHOGRAPHY,
+        tier=TransformTier.EXPERIMENTAL,
+        source=" ",
+        replacement=" " + carrier,
+        whole_word=False,
+        preserve_simple_case=False,
+        block_all_caps=False,
+    )
+
+
+@dataclass(frozen=True, slots=True)
+class InvisibleCarrierAfterAsciiLetterRule(LiteralTransformRule):
+    def __post_init__(self) -> None:
+        require_clean_string("rule_id", self.rule_id)
+        require_clean_string("version", self.version)
+        if self.family is not TransformFamily.ORTHOGRAPHY:
+            raise ValueError("invisible letter-carrier rules must use the orthography family")
+        if self.tier is not TransformTier.EXPERIMENTAL:
+            raise ValueError("invisible letter-carrier rules must use experimental tier")
+        if self.source != INVISIBLE_LETTER_CARRIER_SENTINEL:
+            raise ValueError("invisible letter-carrier rules use the fixed letter sentinel")
+        if not self.replacement.startswith(INVISIBLE_LETTER_CARRIER_SENTINEL):
+            raise ValueError("invisible letter-carrier replacement must keep the letter sentinel")
+        carrier = self.replacement[len(INVISIBLE_LETTER_CARRIER_SENTINEL) :]
+        if len(carrier) != 1:
+            raise ValueError("invisible letter-carrier rules insert exactly one carrier")
+        if "\n" in self.source or "\r" in self.source or "\n" in self.replacement or "\r" in self.replacement:
+            raise ValueError("invisible letter-carrier rules must stay single-line")
+        require_bool("whole_word", self.whole_word)
+        require_bool("preserve_simple_case", self.preserve_simple_case)
+        require_bool("block_all_caps", self.block_all_caps)
+        if self.whole_word or self.preserve_simple_case or self.block_all_caps:
+            raise ValueError("invisible letter-carrier rules use an exact ASCII-letter contract")
+        require_sha256("rule_hash", self.rule_hash)
+        if self.rule_hash != sha256_json(self._payload()):
+            raise ValueError("rule_hash does not match invisible letter-carrier rule")
+
+    def _payload(self) -> dict[str, object]:
+        return {
+            "algorithm_version": RULE_ALGORITHM_VERSION,
+            "rule_id": self.rule_id,
+            "version": self.version,
+            "family": self.family.value,
+            "tier": self.tier.value,
+            "source": self.source,
+            "replacement": self.replacement,
+            "whole_word": self.whole_word,
+            "preserve_simple_case": self.preserve_simple_case,
+            "block_all_caps": self.block_all_caps,
+            "carrier_pattern": INVISIBLE_CARRIER_RULE_ALGORITHM_VERSION,
+        }
+
+    @classmethod
+    def create(cls, codepoint: int) -> "InvisibleCarrierAfterAsciiLetterRule":
+        require_int("codepoint", codepoint)
+        carrier = chr(codepoint)
+        hashed = {
+            "algorithm_version": RULE_ALGORITHM_VERSION,
+            "rule_id": f"product-carrier-letter-{codepoint:04X}",
+            "version": "v1",
+            "family": TransformFamily.ORTHOGRAPHY.value,
+            "tier": TransformTier.EXPERIMENTAL.value,
+            "source": INVISIBLE_LETTER_CARRIER_SENTINEL,
+            "replacement": INVISIBLE_LETTER_CARRIER_SENTINEL + carrier,
+            "whole_word": False,
+            "preserve_simple_case": False,
+            "block_all_caps": False,
+            "carrier_pattern": INVISIBLE_CARRIER_RULE_ALGORITHM_VERSION,
+        }
+        return cls(
+            rule_id=f"product-carrier-letter-{codepoint:04X}",
+            version="v1",
+            family=TransformFamily.ORTHOGRAPHY,
+            tier=TransformTier.EXPERIMENTAL,
+            source=INVISIBLE_LETTER_CARRIER_SENTINEL,
+            replacement=INVISIBLE_LETTER_CARRIER_SENTINEL + carrier,
+            whole_word=False,
+            preserve_simple_case=False,
+            block_all_caps=False,
+            rule_hash=sha256_json(hashed),
+        )
+
+    def pattern(self) -> re.Pattern[str]:
+        return re.compile(r"[A-Za-z]")
+
+    def replacement_for(self, source_text: str) -> str:
+        return source_text + self.replacement[len(INVISIBLE_LETTER_CARRIER_SENTINEL) :]
+
+
+def rule_preserves_visible_projection(rule: LiteralTransformRule, approved_carriers=None) -> bool:
+    approved = normalize_approved_carriers(approved_carriers)
+    if isinstance(rule, InvisibleCarrierAfterAsciiLetterRule):
+        sample_source = "A"
+        sample_replacement = rule.replacement_for(sample_source)
+        return is_carrier_insertion_v1(sample_source, sample_replacement, approved)
+    source = getattr(rule, "source", None)
+    replacement = getattr(rule, "replacement", None)
+    if not isinstance(source, str) or not isinstance(replacement, str):
+        return False
+    return is_carrier_insertion_v1(source, replacement, approved)
diff --git a/fuckmark/product/contract.py b/fuckmark/product/contract.py
new file mode 100644
index 00000000..6220b4ce
--- /dev/null
+++ b/fuckmark/product/contract.py
@@ -0,0 +1,165 @@
+from __future__ import annotations
+
+import json
+from collections.abc import Iterable, Sequence
+from pathlib import Path
+
+from ..hashing import sha256_json
+from .visible_projection import PRODUCT_CONTRACT_ID, VISIBLE_PROJECTION_ALGORITHM_VERSION
+
+
+PRODUCT_CONTRACT_PATH = Path(__file__).resolve().parents[2] / "specs" / "fuckmark-user-visible-invariance-v1.contract.json"
+
+
+def product_contract_payload() -> dict[str, object]:
+    return {
+        "contract_id": PRODUCT_CONTRACT_ID,
+        "contract_version": "v1",
+        "status": "active_product_constraint",
+        "priority": {
+            "rank": 0,
+            "name": "exact_user_visible_text_preservation",
+            "outranks": [
+                "detector_score",
+                "detection_rate",
+                "evasion_rate",
+                "candidate_density",
+                "root_window_destruction",
+                "tokenizer_disruption",
+                "scheduler_quality",
+                "sanitizer_robustness",
+                "semantic_equivalence",
+                "human_fidelity",
+            ],
+        },
+        "scope": {
+            "applies_to": [
+                "release_transform_registry",
+                "public_cli",
+                "product_transform_registry",
+                "cycle8_product_research_intended_for_eventual_release",
+            ],
+            "does_not_rewrite": [
+                "frozen_historical_contracts",
+                "cycle4_formal_evidence",
+                "cycle6_formal_nonzero_residual",
+                "cycle7_visible_edit_research_artifacts",
+            ],
+        },
+        "supported_input_domain": {
+            "id": "ordinary-english-ascii-v1",
+            "allowed_code_points": ["U+0009", "U+000A", "U+000D", "U+0020..U+007E"],
+            "outside_domain": "fail_closed_leave_text_unchanged",
+        },
+        "visible_projection": {
+            "algorithm_version": VISIBLE_PROJECTION_ALGORITHM_VERSION,
+            "rule": "transformed must equal original with only insertions of approved non-rendering carriers",
+            "original_visible_code_points": "intact_same_order",
+            "substitutions": "forbidden",
+            "deletions": "forbidden",
+            "reordering": "forbidden",
+            "visible_ascii_spaces": "immutable",
+            "newlines": "immutable",
+            "tabs": "immutable",
+            "punctuation": "immutable",
+            "letters_words_digits": "immutable",
+        },
+        "allowed_hidden_modifications": {
+            "product_authorized_carriers_v1": [],
+            "research_carriers": "must be individually evidenced before product authorization",
+        },
+        "forbidden_visible_modifications": [
+            "letter_or_word_rewrites",
+            "contraction_or_expansion",
+            "hyphenation_changes",
+            "apostrophe_or_quote_substitution",
+            "punctuation_insertion_or_deletion",
+            "visible_whitespace_changes",
+            "newline_or_layout_changes",
+            "homoglyphs",
+            "compatibility_or_fullwidth_variants",
+            "lookalike_punctuation",
+        ],
+        "renderer_assumptions": {
+            "output": "ordinary_unicode_plain_text",
+            "no_special_renderer": True,
+            "required_environments": ["terminal", "text_editor", "browser_text_box", "clipboard", "file"],
+            "cross_platform_rendering": "unknown_unless_measured",
+        },
+        "plain_text_requirement": {
+            "html_overlays": "forbidden",
+            "css_or_font_tricks": "forbidden",
+            "images_or_canvas": "forbidden",
+            "metadata_outside_payload": "forbidden",
+            "viewer_plugins": "forbidden",
+        },
+        "clipboard_requirement": {
+            "payload": "the_unicode_string_itself",
+            "roundtrip": "utf8_file_and_stdin_stdout_must_preserve_code_points",
+        },
+        "sanitizer_assumptions": {
+            "frozen_cycle6_variants": ["raw", "nfkc", "cf_strip", "nfkc_cf_strip"],
+            "frozen_cycle7_additions": ["ws_collapse", "ws_collapse_nfkc_cf_strip"],
+            "stress_only_not_frozen": ["default_ignorable_removal", "nonspacing_mark_removal"],
+        },
+        "release_gating": {
+            "product_authorized_carriers_required": True,
+            "semantic_fidelity_insufficient": True,
+            "visible_edit_fallback": "forbidden",
+            "empty_authorized_set": "fail_closed_return_original",
+        },
+        "carrier_promotion_evidence": [
+            "unicode_properties",
+            "normalization_nfc_nfd_nfkc_nfkd",
+            "cf_strip_survival",
+            "whitespace_collapse_survival",
+            "combined_sanitizer_survival",
+            "gpt2_tokenization_effect",
+            "rendering_evidence_or_unknown",
+            "copy_paste_survival_or_unknown",
+            "protected_machine_span_safety",
+            "fresh_detector_reduction_is_not_a_substitute_for_visibility",
+        ],
+        "failure_behavior": {
+            "visible_invariant_fail": "reject_candidate_or_return_original",
+            "unsupported_domain": "return_original",
+            "uncertain_carrier_safety": "return_original",
+            "protected_machine_content": "do_not_insert_carriers_inside_span",
+        },
+        "versioning_rules": {
+            "this_contract": "immutable_once_used_for_formal_product_evidence",
+            "successors": "new_filename_and_new_contract_id",
+            "historical_visible_edit_research": "may_replay_but_cannot_enter_release",
+        },
+        "historical_reclassification": {
+            "cycle6_formal": {
+                "detector_result": "NONZERO_RESIDUAL_7_of_192",
+                "product_status": "PRODUCT_DISQUALIFIED",
+                "reason": "visible_ascii_space_insertion",
+            },
+            "cycle7_durable_visible_edits": {
+                "scientific_status": "INSUFFICIENT_EVIDENCE",
+                "product_status": "PRODUCT_DISQUALIFIED",
+                "reason": "visible_word_punctuation_or_layout_edits",
+            },
+            "u200c_visible_projection": {
+                "visibility": "conceptually_product_aligned",
+                "durability": "REJECTED_as_final_durable_mechanism",
+                "reason": "removed_by_cf_strip",
+            },
+        },
+    }
+
+
+def product_contract_hash() -> str:
+    return sha256_json(product_contract_payload())
+
+
+def load_product_contract() -> dict[str, object]:
+    payload = product_contract_payload()
+    contract = {**payload, "contract_hash": sha256_json(payload)}
+    if PRODUCT_CONTRACT_PATH.is_file():
+        disk = json.loads(PRODUCT_CONTRACT_PATH.read_text(encoding="utf-8"))
+        if disk != contract:
+            raise ValueError("product contract file does not match embedded v1 payload")
+    return contract
diff --git a/fuckmark/product/domain.py b/fuckmark/product/domain.py
new file mode 100644
index 00000000..42e13aaf
--- /dev/null
+++ b/fuckmark/product/domain.py
@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+
+PRODUCT_DOMAIN_ID = "ordinary-english-ascii-v1"
+_ALLOWED = frozenset({9, 10, 13, *range(0x20, 0x7F)})
+
+
+def is_supported_product_domain_v1(text: str) -> bool:
+    if not isinstance(text, str):
+        raise TypeError("text must be a string")
+    return all(ord(character) in _ALLOWED for character in text)
diff --git a/fuckmark/product/invariants.py b/fuckmark/product/invariants.py
new file mode 100644
index 00000000..38fa6d11
--- /dev/null
+++ b/fuckmark/product/invariants.py
@@ -0,0 +1,121 @@
+from __future__ import annotations
+
+from collections.abc import Iterable
+from dataclasses import dataclass
+from enum import Enum
+
+from .._validation import require_sha256
+from ..hashing import sha256_json, sha256_text
+from ..transforms.schema import InvariantStatus
+from .visible_projection import (
+    VISIBLE_PROJECTION_ALGORITHM_VERSION,
+    is_carrier_insertion_v1,
+    normalize_approved_carriers,
+    product_approved_carriers_v1,
+    project_visible_v1,
+)
+
+
+USER_VISIBLE_INVARIANT_ALGORITHM_VERSION = "user-visible-invariant-v1"
+
+
+class UserVisibleInvariantReason(str, Enum):
+    USER_VISIBLE_TEXT_CHANGED = "user_visible_text_changed"
+
+
+@dataclass(frozen=True, slots=True)
+class UserVisibleInvariantReport:
+    status: InvariantStatus
+    original_hash: str
+    transformed_hash: str
+    original_projection_hash: str
+    transformed_projection_hash: str
+    approved_carriers: tuple[int, ...]
+    reasons: tuple[UserVisibleInvariantReason, ...]
+    report_hash: str
+
+    def __post_init__(self) -> None:
+        if not isinstance(self.status, InvariantStatus):
+            raise TypeError("status must be an InvariantStatus")
+        require_sha256("original_hash", self.original_hash)
+        require_sha256("transformed_hash", self.transformed_hash)
+        require_sha256("original_projection_hash", self.original_projection_hash)
+        require_sha256("transformed_projection_hash", self.transformed_projection_hash)
+        carriers = tuple(self.approved_carriers)
+        if any(not isinstance(value, int) or isinstance(value, bool) for value in carriers):
+            raise TypeError("approved_carriers must contain integers")
+        if carriers != tuple(sorted(set(carriers))):
+            raise ValueError("approved_carriers must be unique and sorted")
+        object.__setattr__(self, "approved_carriers", carriers)
+        reasons = tuple(self.reasons)
+        if any(not isinstance(value, UserVisibleInvariantReason) for value in reasons):
+            raise TypeError("reasons must contain UserVisibleInvariantReason values")
+        if reasons != tuple(sorted(set(reasons), key=lambda value: value.value)):
+            raise ValueError("reasons must be unique and sorted")
+        object.__setattr__(self, "reasons", reasons)
+        expected_status = InvariantStatus.PASS if not reasons else InvariantStatus.FAIL
+        if self.status is not expected_status:
+            raise ValueError("user-visible invariant status does not match reasons")
+        require_sha256("report_hash", self.report_hash)
+        if self.report_hash != sha256_json(self._payload()):
+            raise ValueError("report_hash does not match user-visible invariant report")
+
+    def _payload(self) -> dict[str, object]:
+        return {
+            "algorithm_version": USER_VISIBLE_INVARIANT_ALGORITHM_VERSION,
+            "projection_algorithm_version": VISIBLE_PROJECTION_ALGORITHM_VERSION,
+            "status": self.status.value,
+            "original_hash": self.original_hash,
+            "transformed_hash": self.transformed_hash,
+            "original_projection_hash": self.original_projection_hash,
+            "transformed_projection_hash": self.transformed_projection_hash,
+            "approved_carriers": self.approved_carriers,
+            "reasons": tuple(value.value for value in self.reasons),
+        }
+
+
+def validate_user_visible_invariants(
+    original: str,
+    transformed: str,
+    approved_carriers: Iterable[int] | None = None,
+) -> UserVisibleInvariantReport:
+    if not isinstance(original, str) or not isinstance(transformed, str):
+        raise TypeError("original and transformed must be strings")
+    approved = normalize_approved_carriers(
+        product_approved_carriers_v1() if approved_carriers is None else approved_carriers
+    )
+    ordered = tuple(sorted(approved))
+    original_projection = project_visible_v1(original, approved)
+    transformed_projection = project_visible_v1(transformed, approved)
+    reasons: list[UserVisibleInvariantReason] = []
+    if not is_carrier_insertion_v1(original, transformed, approved):
+        reasons.append(UserVisibleInvariantReason.USER_VISIBLE_TEXT_CHANGED)
+    elif original_projection != transformed_projection:
+        reasons.append(UserVisibleInvariantReason.USER_VISIBLE_TEXT_CHANGED)
+    normalized_reasons = tuple(sorted(set(reasons), key=lambda value: value.value))
+    status = InvariantStatus.PASS if not normalized_reasons else InvariantStatus.FAIL
+    original_hash = sha256_text(original)
+    transformed_hash = sha256_text(transformed)
+    original_projection_hash = sha256_text(original_projection)
+    transformed_projection_hash = sha256_text(transformed_projection)
+    payload = {
+        "algorithm_version": USER_VISIBLE_INVARIANT_ALGORITHM_VERSION,
+        "projection_algorithm_version": VISIBLE_PROJECTION_ALGORITHM_VERSION,
+        "status": status.value,
+        "original_hash": original_hash,
+        "transformed_hash": transformed_hash,
+        "original_projection_hash": original_projection_hash,
+        "transformed_projection_hash": transformed_projection_hash,
+        "approved_carriers": ordered,
+        "reasons": tuple(value.value for value in normalized_reasons),
+    }
+    return UserVisibleInvariantReport(
+        status,
+        original_hash,
+        transformed_hash,
+        original_projection_hash,
+        transformed_projection_hash,
+        ordered,
+        normalized_reasons,
+        sha256_json(payload),
+    )
diff --git a/fuckmark/product/registry.py b/fuckmark/product/registry.py
new file mode 100644
index 00000000..6305c7ff
--- /dev/null
+++ b/fuckmark/product/registry.py
@@ -0,0 +1,152 @@
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from ..hashing import sha256_json
+from ..transforms.candidate_artifacts import CandidateEnumeration, _build_conflicts
+from ..transforms.quote_policy import BLANKET_QUOTE_PROTECTION_POLICY_ID
+from ..transforms.registry import (
+    TRANSFORM_REGISTRY_ALGORITHM_VERSION,
+    TransformRegistry,
+    _make_rejection,
+)
+from ..transforms.schema import CandidateRejectionReason, InvariantStatus
+from .carriers import rule_preserves_visible_projection
+from .contract import PRODUCT_CONTRACT_ID
+from .domain import is_supported_product_domain_v1
+from .invariants import validate_user_visible_invariants
+from .visible_projection import is_carrier_insertion_v1, normalize_approved_carriers, product_approved_carriers_v1, project_visible_v1
+
+
+PRODUCT_REGISTRY_ALGORITHM_VERSION = "product-transform-registry-v1"
+
+
+class ProductTransformRegistry(TransformRegistry):
+    __slots__ = ("_approved_carriers",)
+
+    def __init__(
+        self,
+        rules: Sequence = (),
+        identifiers: Sequence[str] = (),
+        *,
+        approved_carriers: Sequence[int] = (),
+        quote_policy_id: str = BLANKET_QUOTE_PROTECTION_POLICY_ID,
+    ) -> None:
+        self._approved_carriers = tuple(sorted(normalize_approved_carriers(approved_carriers)))
+        super().__init__(
+            rules,
+            identifiers,
+            quote_policy_id=quote_policy_id,
+            allow_empty=True,
+        )
+        payload = {
+            "algorithm_version": PRODUCT_REGISTRY_ALGORITHM_VERSION,
+            "base_registry_version": TRANSFORM_REGISTRY_ALGORITHM_VERSION,
+            "product_contract_id": PRODUCT_CONTRACT_ID,
+            "approved_carriers": self._approved_carriers,
+            "quote_policy_id": quote_policy_id,
+            "rules": self.rules,
+        }
+        self._ruleset_hash = sha256_json(payload)
+
+    @property
+    def approved_carriers(self) -> tuple[int, ...]:
+        return self._approved_carriers
+
+    def enumerate(self, text: str, user_ranges=()) -> CandidateEnumeration:
+        original = super().enumerate(text, user_ranges)
+        approved = frozenset(self._approved_carriers)
+        if not is_supported_product_domain_v1(text) or project_visible_v1(text, approved) != text:
+            payload = {
+                "algorithm_version": original.algorithm_version,
+                "input_hash": original.input_hash,
+                "ruleset_hash": self.ruleset_hash,
+                "protected_manifest_hash": original.protected_manifest.manifest_hash,
+                "candidates": (),
+                "rejections": original.rejections,
+                "conflicts": (),
+            }
+            return CandidateEnumeration(
+                original.algorithm_version,
+                original.input_text,
+                original.input_hash,
+                self.ruleset_hash,
+                original.protected_manifest,
+                (),
+                original.rejections,
+                (),
+                sha256_json(payload),
+            )
+        approved = frozenset(self._approved_carriers)
+        by_identity = {(rule.rule_id, rule.version, rule.rule_hash): rule for rule in self.rules}
+        candidates = []
+        extra_rejections = list(original.rejections)
+        for candidate in original.candidates:
+            trial = text[: candidate.start] + candidate.replacement_text + text[candidate.end :]
+            if not is_carrier_insertion_v1(text, trial, approved):
+                rule = by_identity[(candidate.rule_id, candidate.rule_version, candidate.rule_hash)]
+                extra_rejections.append(
+                    _make_rejection(
+                        original.input_hash,
+                        rule,
+                        candidate.start,
+                        candidate.end,
+                        candidate.source_text,
+                        CandidateRejectionReason.USER_VISIBLE_TEXT_CHANGED,
+                    )
+                )
+                continue
+            candidates.append(candidate)
+        ordered = tuple(candidates)
+        ordered_rejections = tuple(
+            sorted(
+                extra_rejections,
+                key=lambda value: (value.start, value.end, value.rule_id, value.reason.value, value.rejection_hash),
+            )
+        )
+        conflicts = _build_conflicts(ordered)
+        payload = {
+            "algorithm_version": original.algorithm_version,
+            "input_hash": original.input_hash,
+            "ruleset_hash": self.ruleset_hash,
+            "protected_manifest_hash": original.protected_manifest.manifest_hash,
+            "candidates": ordered,
+            "rejections": ordered_rejections,
+            "conflicts": conflicts,
+        }
+        return CandidateEnumeration(
+            original.algorithm_version,
+            original.input_text,
+            original.input_hash,
+            self.ruleset_hash,
+            original.protected_manifest,
+            ordered,
+            ordered_rejections,
+            conflicts,
+            sha256_json(payload),
+        )
+
+    def apply(self, enumeration: CandidateEnumeration, candidate_ids: Sequence[str], seed: int = 0):
+        result = super().apply(enumeration, candidate_ids, seed=seed)
+        report = validate_user_visible_invariants(
+            enumeration.input_text,
+            result.output_text,
+            self._approved_carriers,
+        )
+        if report.status is not InvariantStatus.PASS:
+            raise ValueError("transformation violated user-visible text invariance")
+        return result
+
+
+def product_transform_registry(
+    identifiers: Sequence[str] = (),
+    *,
+    rules: Sequence = (),
+    approved_carriers: Sequence[int] = (),
+) -> ProductTransformRegistry:
+    approved = tuple(approved_carriers) if approved_carriers else tuple(product_approved_carriers_v1())
+    if rules:
+        for rule in rules:
+            if not rule_preserves_visible_projection(rule, approved):
+                raise ValueError("product registry refused a visible-edit rule")
+    return ProductTransformRegistry(rules, identifiers, approved_carriers=approved)
diff --git a/fuckmark/product/rendering.py b/fuckmark/product/rendering.py
new file mode 100644
index 00000000..c30c7487
--- /dev/null
+++ b/fuckmark/product/rendering.py
@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+import tempfile
+import time
+from dataclasses import dataclass
+from pathlib import Path
+
+from ..hashing import sha256_json, sha256_text
+
+
+RENDERING_HARNESS_VERSION = "product-reference-render-v1"
+_CHROME_NAMES = ("google-chrome", "google-chrome-stable", "chromium", "chromium-browser", "chrome")
+
+
+@dataclass(frozen=True, slots=True)
+class ReferenceRenderComparison:
+    environment: str
+    status: str
+    original_sha256: str
+    transformed_sha256: str
+    equal: bool | None
+    detail: str
+    comparison_hash: str
+
+    def payload(self) -> dict[str, object]:
+        return {
+            "algorithm_version": RENDERING_HARNESS_VERSION,
+            "environment": self.environment,
+            "status": self.status,
+            "original_sha256": self.original_sha256,
+            "transformed_sha256": self.transformed_sha256,
+            "equal": self.equal,
+            "detail": self.detail,
+        }
+
+
+def chrome_executable() -> str | None:
+    for name in _CHROME_NAMES:
+        path = shutil.which(name)
+        if path:
+            return path
+    return None
+
+
+def compare_chrome_pre_screenshots(original: str, transformed: str) -> ReferenceRenderComparison:
+    if not isinstance(original, str) or not isinstance(transformed, str):
+        raise TypeError("original and transformed must be strings")
+    executable = chrome_executable()
+    unknown = {
+        "algorithm_version": RENDERING_HARNESS_VERSION,
+        "environment": "chromium_headless",
+        "status": "UNKNOWN",
+        "original_sha256": sha256_text(original),
+        "transformed_sha256": sha256_text(transformed),
+        "equal": None,
+        "detail": "no chromium executable on this host",
+    }
+    if executable is None:
+        return ReferenceRenderComparison(
+            "chromium_headless",
+            "UNKNOWN",
+            sha256_text(original),
+            sha256_text(transformed),
+            None,
+            "no chromium executable on this host",
+            sha256_json(unknown),
+        )
+    try:
+        with tempfile.TemporaryDirectory(prefix="fuckmark-render-") as directory:
+            root = Path(directory)
+            original_png = _render_pre(executable, root, "original", original)
+            transformed_png = _render_pre(executable, root, "transformed", transformed)
+    except (OSError, subprocess.CalledProcessError, subprocess.TimeoutExpired) as error:
+        payload = {
+            "algorithm_version": RENDERING_HARNESS_VERSION,
+            "environment": "chromium_headless",
+            "status": "UNKNOWN",
+            "original_sha256": sha256_text(original),
+            "transformed_sha256": sha256_text(transformed),
+            "equal": None,
+            "detail": type(error).__name__,
+        }
+        return ReferenceRenderComparison(
+            "chromium_headless",
+            "UNKNOWN",
+            sha256_text(original),
+            sha256_text(transformed),
+            None,
+            type(error).__name__,
+            sha256_json(payload),
+        )
+    equal = original_png == transformed_png
+    status = "VERIFIED" if equal else "REJECTED"
+    detail = "png_bytes_equal" if equal else "png_bytes_differ"
+    payload = {
+        "algorithm_version": RENDERING_HARNESS_VERSION,
+        "environment": "chromium_headless",
+        "status": status,
+        "original_sha256": sha256_text(original),
+        "transformed_sha256": sha256_text(transformed),
+        "equal": equal,
+        "detail": detail,
+    }
+    return ReferenceRenderComparison(
+        "chromium_headless",
+        status,
+        sha256_text(original),
+        sha256_text(transformed),
+        equal,
+        detail,
+        sha256_json(payload),
+    )
+
+
+def _html_page(text: str) -> str:
+    payload = json.dumps(text, ensure_ascii=False).replace("<", "\\u003c").replace(">", "\\u003e")
+    return (
+        "<!doctype html><html><head><meta charset='utf-8'></head>"
+        "<body style='margin:0;background:#fff'>"
+        "<pre id='t' style=\"margin:16px;font:16px/24px 'DejaVu Sans Mono',monospace;"
+        "white-space:pre-wrap;color:#000\"></pre>"
+        f"<script>document.getElementById('t').textContent={payload};</script>"
+        "</body></html>"
+    )
+
+
+def _render_pre(executable: str, root: Path, name: str, text: str) -> bytes:
+    html_path = root / f"{name}.html"
+    png_path = root / f"{name}.png"
+    html_path.write_text(_html_page(text), encoding="utf-8")
+    process = subprocess.Popen(
+        [
+            executable,
+            "--headless=new",
+            "--disable-gpu",
+            "--no-sandbox",
+            "--disable-dev-shm-usage",
+            "--hide-scrollbars",
+            "--no-first-run",
+            "--disable-background-networking",
+            "--virtual-time-budget=5000",
+            "--window-size=800,200",
+            f"--screenshot={png_path}",
+            html_path.as_uri(),
+        ],
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+    try:
+        deadline = time.monotonic() + 30
+        while time.monotonic() < deadline:
+            if png_path.exists() and png_path.stat().st_size > 0:
+                time.sleep(0.25)
+                break
+            if process.poll() is not None:
+                break
+            time.sleep(0.05)
+        else:
+            raise subprocess.TimeoutExpired(process.args, 30)
+        if not png_path.exists() or png_path.stat().st_size == 0:
+            raise OSError("chrome screenshot missing")
+        return png_path.read_bytes()
+    finally:
+        if process.poll() is None:
+            process.kill()
+            try:
+                process.wait(timeout=5)
+            except subprocess.TimeoutExpired:
+                process.kill()
diff --git a/fuckmark/product/visible_projection.py b/fuckmark/product/visible_projection.py
new file mode 100644
index 00000000..dad068cd
--- /dev/null
+++ b/fuckmark/product/visible_projection.py
@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+from collections.abc import Iterable
+
+from .._validation import require_int
+
+
+VISIBLE_PROJECTION_ALGORITHM_VERSION = "fuckmark-visible-projection-v1"
+PRODUCT_CONTRACT_ID = "fuckmark-user-visible-invariance-v1"
+
+
+def product_approved_carriers_v1() -> frozenset[int]:
+    return frozenset()
+
+
+def normalize_approved_carriers(carriers: Iterable[int] | None) -> frozenset[int]:
+    if carriers is None:
+        return product_approved_carriers_v1()
+    values = frozenset(carriers)
+    for value in values:
+        require_int("carrier", value)
+        if value < 0 or value > 0x10FFFF:
+            raise ValueError("carrier must be a Unicode scalar value")
+        if 0xD800 <= value <= 0xDFFF:
+            raise ValueError("carrier must not be a surrogate")
+    return values
+
+
+def project_visible_v1(text: str, approved_carriers: Iterable[int] | None = None) -> str:
+    if not isinstance(text, str):
+        raise TypeError("text must be a string")
+    approved = normalize_approved_carriers(approved_carriers)
+    if not approved:
+        return text
+    return "".join(character for character in text if ord(character) not in approved)
+
+
+def is_carrier_insertion_v1(
+    original: str,
+    transformed: str,
+    approved_carriers: Iterable[int] | None = None,
+) -> bool:
+    if not isinstance(original, str) or not isinstance(transformed, str):
+        raise TypeError("original and transformed must be strings")
+    approved = normalize_approved_carriers(approved_carriers)
+    index = 0
+    original_length = len(original)
+    for character in transformed:
+        if index < original_length and character == original[index]:
+            index += 1
+            continue
+        if ord(character) in approved:
+            continue
+        return False
+    return index == original_length
diff --git a/fuckmark/synthid_geometry_hf.py b/fuckmark/synthid_geometry_hf.py
index 46f812b5..56380167 100644
--- a/fuckmark/synthid_geometry_hf.py
+++ b/fuckmark/synthid_geometry_hf.py
@@ -14,7 +14,7 @@
     DEFAULT_PROMPTS,
     HuggingFaceSynthIDSmokeBackend,
 )
-from .transforms import development_transform_registry, release_transform_registry
+from .transforms import development_transform_registry, historical_visible_edit_transform_registry, release_transform_registry
 from .transforms.mechanism_registry import mechanism_stress_transform_registry
 
 
@@ -58,6 +58,8 @@ def _load_prompts(path: Path | None, limit: int, seed_base: int) -> tuple[SynthI
 def _registry(name: str):
     if name == "release":
         return release_transform_registry()
+    if name in ("historical-visible-edit", "default"):
+        return historical_visible_edit_transform_registry()
     if name == "development":
         return development_transform_registry()
     if name == "mechanism":
@@ -168,7 +170,7 @@ def _parser() -> argparse.ArgumentParser:
     parser.add_argument("--temperature", type=float, default=0.8)
     parser.add_argument("--top-k", type=int, default=50)
     parser.add_argument("--top-p", type=float, default=0.95)
-    parser.add_argument("--registry", choices=("release", "development", "mechanism"), default="release")
+    parser.add_argument("--registry", choices=("release", "historical-visible-edit", "default", "development", "mechanism"), default="release")
     parser.add_argument("--budgets", type=_parse_budgets, default=(1, 2))
     parser.add_argument("--random-seed-count", type=int, default=8)
     parser.add_argument("--schedule-seed-base", type=int, default=9200)
diff --git a/fuckmark/synthid_schedule_stress_hf.py b/fuckmark/synthid_schedule_stress_hf.py
index 5b774c22..ed3f1b92 100644
--- a/fuckmark/synthid_schedule_stress_hf.py
+++ b/fuckmark/synthid_schedule_stress_hf.py
@@ -10,7 +10,7 @@
 from .experiments.synthid_smoke import SynthIDSmokePrompt
 from .synthid_geometry_hf import HuggingFaceSynthIDGeometryBackend
 from .synthid_smoke_hf import DEFAULT_KEYS, DEFAULT_NGRAM_LEN
-from .transforms import development_transform_registry, release_transform_registry
+from .transforms import development_transform_registry, historical_visible_edit_transform_registry, release_transform_registry
 from .transforms.mechanism_registry import mechanism_stress_transform_registry
 
 
@@ -166,7 +166,7 @@ def _parser() -> argparse.ArgumentParser:
     parser.add_argument("--temperature", type=float, default=0.8)
     parser.add_argument("--top-k", type=int, default=50)
     parser.add_argument("--top-p", type=float, default=0.95)
-    parser.add_argument("--registry", choices=("release", "development", "mechanism"), default="release")
+    parser.add_argument("--registry", choices=("release", "historical-visible-edit", "default", "development", "mechanism"), default="release")
     parser.add_argument("--budgets", type=_parse_budgets, default=(1, 2, 4))
     parser.add_argument("--random-seed-count", type=int, default=8)
     parser.add_argument("--schedule-seed-base", type=int, default=9300)
@@ -179,6 +179,8 @@ def _parser() -> argparse.ArgumentParser:
 def _registry(name: str):
     if name == "release":
         return release_transform_registry()
+    if name in ("historical-visible-edit", "default"):
+        return historical_visible_edit_transform_registry()
     if name == "development":
         return development_transform_registry()
     if name == "mechanism":
diff --git a/fuckmark/transforms/__init__.py b/fuckmark/transforms/__init__.py
index 981a9802..842cce60 100644
--- a/fuckmark/transforms/__init__.py
+++ b/fuckmark/transforms/__init__.py
@@ -66,6 +66,7 @@
     LEXICAL_PROMOTION_EVIDENCE_ALGORITHM_VERSION,
     FidelityEvidenceVerificationError,
     LexicalPromotionEvidence,
+    source_verified_historical_visible_edit_transform_registry,
     source_verified_release_transform_registry,
     verify_fidelity_review_sample,
     verify_grammar_fixture,
@@ -112,6 +113,7 @@
     TransformRegistry,
     default_transform_registry,
     development_transform_registry,
+    historical_visible_edit_transform_registry,
     release_transform_registry,
 )
 from .rules import (
@@ -209,6 +211,7 @@
     "bind_blind_review_judgment",
     "bind_blind_review_judgments",
     "build_blind_review_packet",
+    "source_verified_historical_visible_edit_transform_registry",
     "source_verified_release_transform_registry",
     "verify_fidelity_review_sample",
     "verify_blind_review_packet",
@@ -322,6 +325,7 @@
     "development_lexical_rules",
     "development_syntax_rules",
     "development_transform_registry",
+    "historical_visible_edit_transform_registry",
     "release_transform_registry",
     "require_complete_lexical_audit_summaries",
     "validate_effectiveness_profile_registry",
diff --git a/fuckmark/transforms/fidelity_verification.py b/fuckmark/transforms/fidelity_verification.py
index 0c3abd4a..40753295 100644
--- a/fuckmark/transforms/fidelity_verification.py
+++ b/fuckmark/transforms/fidelity_verification.py
@@ -196,7 +196,7 @@ def verify_lexical_promotion_evidence(
     return summary
 
 
-def source_verified_release_transform_registry(
+def source_verified_historical_visible_edit_transform_registry(
     promotions: Sequence[LexicalPromotionEvidence],
     tokenizers: Mapping[str, Callable[[str], Sequence[int]]],
     identifiers: Sequence[str] = (),
@@ -223,3 +223,38 @@ def source_verified_release_transform_registry(
         approved.append(promotion.rule)
     ordered = tuple(sorted(approved, key=lambda value: (value.rule_id, value.version, value.rule_hash)))
     return TransformRegistry((*default_contraction_rules(), *ordered), identifiers)
+
+
+def source_verified_release_transform_registry(
+    promotions: Sequence[LexicalPromotionEvidence],
+    tokenizers: Mapping[str, Callable[[str], Sequence[int]]],
+    identifiers: Sequence[str] = (),
+) -> TransformRegistry:
+    if not isinstance(promotions, Sequence) or isinstance(promotions, (str, bytes, bytearray)):
+        raise TypeError("promotions must be a sequence")
+    if not isinstance(tokenizers, Mapping):
+        raise TypeError("tokenizers must be a mapping")
+    promotion_tuple = tuple(promotions)
+    from ..product.carriers import rule_preserves_visible_projection
+    from ..product.registry import product_transform_registry
+    from ..product.visible_projection import product_approved_carriers_v1
+
+    if not promotion_tuple:
+        return product_transform_registry(identifiers)
+    if any(not isinstance(value, LexicalPromotionEvidence) for value in promotion_tuple):
+        raise TypeError("promotions must contain LexicalPromotionEvidence values")
+    if len({value.rule.rule_hash for value in promotion_tuple}) != len(promotion_tuple):
+        raise FidelityEvidenceVerificationError("lexical promotion rules must be unique")
+    approved_carriers = product_approved_carriers_v1()
+    for promotion in promotion_tuple:
+        identity_hash = promotion.model_tokenizer_identity.identity_hash
+        try:
+            tokenizer = tokenizers[identity_hash]
+        except KeyError as error:
+            raise FidelityEvidenceVerificationError("missing tokenizer callable for promotion identity") from error
+        verify_lexical_promotion_evidence(promotion, tokenizer)
+        if not rule_preserves_visible_projection(promotion.rule, approved_carriers):
+            raise FidelityEvidenceVerificationError(
+                "lexical promotion changes user-visible text and cannot enter the product release registry"
+            )
+    return product_transform_registry(identifiers)
diff --git a/fuckmark/transforms/registry.py b/fuckmark/transforms/registry.py
index 49aa4a54..3c6f43d2 100644
--- a/fuckmark/transforms/registry.py
+++ b/fuckmark/transforms/registry.py
@@ -78,8 +78,9 @@ def __init__(
         identifiers: Sequence[str] = (),
         *,
         quote_policy_id: str = BLANKET_QUOTE_PROTECTION_POLICY_ID,
+        allow_empty: bool = False,
     ) -> None:
-        self._rules = validate_rules(rules)
+        self._rules = validate_rules(rules, allow_empty=allow_empty)
         if quote_policy_id not in (
             BLANKET_QUOTE_PROTECTION_POLICY_ID,
             QUOTE_SAFE_SURFACE_POLICY_ID,
@@ -264,6 +265,10 @@ def default_transform_registry(identifiers: Sequence[str] = ()) -> TransformRegi
     return TransformRegistry(default_contraction_rules(), identifiers)
 
 
+def historical_visible_edit_transform_registry(identifiers: Sequence[str] = ()) -> TransformRegistry:
+    return default_transform_registry(identifiers)
+
+
 def development_transform_registry(identifiers: Sequence[str] = ()) -> TransformRegistry:
     return TransformRegistry((*default_contraction_rules(), *development_surface_rules(), *development_lexical_rules(), *development_syntax_rules()), identifiers)
 
@@ -275,6 +280,8 @@ def release_transform_registry(
 ) -> TransformRegistry:
     if lexical_rules or lexical_audits:
         raise LexicalRulePromotionError(
-            "release promotion requires source-grounded verified fidelity evidence; summary audit artifacts cannot authorize release"
+            "release promotion requires product-visible-invariance authorization and source-grounded verified fidelity evidence; summary audit artifacts cannot authorize release"
         )
-    return TransformRegistry(default_contraction_rules(), identifiers)
+    from ..product.registry import product_transform_registry
+
+    return product_transform_registry(identifiers)
diff --git a/fuckmark/transforms/rules.py b/fuckmark/transforms/rules.py
index 155f9cd8..468eda43 100644
--- a/fuckmark/transforms/rules.py
+++ b/fuckmark/transforms/rules.py
@@ -373,13 +373,15 @@ def default_contraction_rules() -> tuple[LiteralTransformRule, ...]:
 TransformRule = LiteralTransformRule | LexicalTemplateRule | SyntaxTemplateRule
 
 
-def validate_rules(rules: Sequence[TransformRule]) -> tuple[TransformRule, ...]:
+def validate_rules(rules: Sequence[TransformRule], *, allow_empty: bool = False) -> tuple[TransformRule, ...]:
     if not isinstance(rules, Sequence) or isinstance(rules, (str, bytes, bytearray)):
         raise TypeError("rules must be a sequence")
     if len(rules) > _MAX_RULES:
         raise ValueError("rules exceeded resource limit")
     normalized = tuple(rules)
     if not normalized:
+        if allow_empty:
+            return ()
         raise ValueError("rules must not be empty")
     if any(not isinstance(rule, (LiteralTransformRule, LexicalTemplateRule, SyntaxTemplateRule)) for rule in normalized):
         raise TypeError("rules must contain supported transform rule values")
diff --git a/fuckmark/transforms/schema.py b/fuckmark/transforms/schema.py
index b8b2a201..bc77188f 100644
--- a/fuckmark/transforms/schema.py
+++ b/fuckmark/transforms/schema.py
@@ -45,6 +45,7 @@ class CandidateRejectionReason(str, Enum):
     ALL_CAPS_BLOCKED = "all_caps_blocked"
     UNSUPPORTED_CASE = "unsupported_case"
     PRECONDITION_FAILED = "precondition_failed"
+    USER_VISIBLE_TEXT_CHANGED = "user_visible_text_changed"
 
 
 class InvariantStatus(str, Enum):
diff --git a/specs/cycle8/carrier-screen-v1.summary.json b/specs/cycle8/carrier-screen-v1.summary.json
new file mode 100644
index 00000000..139d4ce7
--- /dev/null
+++ b/specs/cycle8/carrier-screen-v1.summary.json
@@ -0,0 +1 @@
+{"chromium_render":"UNKNOWN","classification_counts":{"DIAGNOSTIC_CF":129,"DURABLE_TRACK_CANDIDATE":263,"REJECTED_RENDERING_OR_CONTROL_RISK":13,"REJECTED_UNASSIGNED":3769},"default_ignorable_count":4174,"durable_track_count":263,"durable_track_labels":["U+034F","U+17B4","U+17B5","U+180B","U+180C","U+180D","U+180F","U+FE00","U+FE01","U+FE02","U+FE03","U+FE04","U+FE05","U+FE06","U+FE07","U+FE08","U+FE09","U+FE0A","U+FE0B","U+FE0C","U+FE0D","U+FE0E","U+FE0F","U+E0100","U+E0101","U+E0102","U+E0103","U+E0104","U+E0105","U+E0106","U+E0107","U+E0108","U+E0109","U+E010A","U+E010B","U+E010C","U+E010D","U+E010E","U+E010F","U+E0110","U+E0111","U+E0112","U+E0113","U+E0114","U+E0115","U+E0116","U+E0117","U+E0118","U+E0119","U+E011A","U+E011B","U+E011C","U+E011D","U+E011E","U+E011F","U+E0120","U+E0121","U+E0122","U+E0123","U+E0124","U+E0125","U+E0126","U+E0127","U+E0128","U+E0129","U+E012A","U+E012B","U+E012C","U+E012D","U+E012E","U+E012F","U+E0130","U+E0131","U+E0132","U+E0133","U+E0134","U+E0135","U+E0136","U+E0137","U+E0138","U+E0139","U+E013A","U+E013B","U+E013C","U+E013D","U+E013E","U+E013F","U+E0140","U+E0141","U+E0142","U+E0143","U+E0144","U+E0145","U+E0146","U+E0147","U+E0148","U+E0149","U+E014A","U+E014B","U+E014C","U+E014D","U+E014E","U+E014F","U+E0150","U+E0151","U+E0152","U+E0153","U+E0154","U+E0155","U+E0156","U+E0157","U+E0158","U+E0159","U+E015A","U+E015B","U+E015C","U+E015D","U+E015E","U+E015F","U+E0160","U+E0161","U+E0162","U+E0163","U+E0164","U+E0165","U+E0166","U+E0167","U+E0168","U+E0169","U+E016A","U+E016B","U+E016C","U+E016D","U+E016E","U+E016F","U+E0170","U+E0171","U+E0172","U+E0173","U+E0174","U+E0175","U+E0176","U+E0177","U+E0178","U+E0179","U+E017A","U+E017B","U+E017C","U+E017D","U+E017E","U+E017F","U+E0180","U+E0181","U+E0182","U+E0183","U+E0184","U+E0185","U+E0186","U+E0187","U+E0188","U+E0189","U+E018A","U+E018B","U+E018C","U+E018D","U+E018E","U+E018F","U+E0190","U+E0191","U+E0192","U+E0193","U+E0194","U+E0195","U+E0196","U+E0197","U+E0198","U+E0199","U+E019A","U+E019B","U+E019C","U+E019D","U+E019E","U+E019F","U+E01A0","U+E01A1","U+E01A2","U+E01A3","U+E01A4","U+E01A5","U+E01A6","U+E01A7","U+E01A8","U+E01A9","U+E01AA","U+E01AB","U+E01AC","U+E01AD","U+E01AE","U+E01AF","U+E01B0","U+E01B1","U+E01B2","U+E01B3","U+E01B4","U+E01B5","U+E01B6","U+E01B7","U+E01B8","U+E01B9","U+E01BA","U+E01BB","U+E01BC","U+E01BD","U+E01BE","U+E01BF","U+E01C0","U+E01C1","U+E01C2","U+E01C3","U+E01C4","U+E01C5","U+E01C6","U+E01C7","U+E01C8","U+E01C9","U+E01CA","U+E01CB","U+E01CC","U+E01CD","U+E01CE","U+E01CF","U+E01D0","U+E01D1","U+E01D2","U+E01D3","U+E01D4","U+E01D5","U+E01D6","U+E01D7","U+E01D8","U+E01D9","U+E01DA","U+E01DB","U+E01DC","U+E01DD","U+E01DE","U+E01DF","U+E01E0","U+E01E1","U+E01E2","U+E01E3","U+E01E4","U+E01E5","U+E01E6","U+E01E7","U+E01E8","U+E01E9","U+E01EA","U+E01EB","U+E01EC","U+E01ED","U+E01EE","U+E01EF"],"focus":[{"assigned":true,"bidi_override":false,"bidirectional_class":"BN","category":"Cf","cf_strip_survives":false,"classification":"DIAGNOSTIC_CF","codepoint":8204,"combined_ws_nfkc_cf_survives":false,"combining_class":0,"control_category":false,"default_ignorable":true,"east_asian_width":"N","format_category":true,"label":"U+200C","name":"ZERO 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diff --git a/specs/cycle8/fixture-decision-v1.json b/specs/cycle8/fixture-decision-v1.json
new file mode 100644
index 00000000..17ca6099
--- /dev/null
+++ b/specs/cycle8/fixture-decision-v1.json
@@ -0,0 +1 @@
+{"algorithm_version":"cycle8-fixture-decision-v1","decision":"INSUFFICIENT_EVIDENCE","detector_signal":null,"evidence_label":"HYPOTHESIS","notes":"This is Cycle 8 development classification, not confirmation. Do not inspect 830000, 840000, 850000, or Cycle 7 reserved 880000. U+034F is not product-authorized.","product_gate":"VISIBLE_INVARIANT_PASS","reasons":["U+200C is removed by Cf-strip","U+034F survives Cf-strip on the GPT-2 fixture","U+034F survives NFKC on the GPT-2 fixture","U+034F survives whitespace-collapse-v1 after ASCII spaces","quote interiors block U+034F space carriers as protected spans","U+034F space insertion changes GPT-2 token ids","U+034F x8 increases hidden payload over x1","U+FE00 survives Cf-strip on the GPT-2 fixture","no Cycle 8 detector scores on seed 890000 in this fixture artifact"],"visible_failures":0}
diff --git a/specs/cycle8/fuckmark-cycle8-seed-ledger-v1.json b/specs/cycle8/fuckmark-cycle8-seed-ledger-v1.json
new file mode 100644
index 00000000..7b592f9e
--- /dev/null
+++ b/specs/cycle8/fuckmark-cycle8-seed-ledger-v1.json
@@ -0,0 +1 @@
+{"algorithm_version":"cycle8-seed-ledger-v1","confirmation_reserved_seed_bases":[830000,840000,850000],"cycle7_unseen_validation_seed_base":880000,"exploratory_development_seed_base":890000,"exploratory_development_seed_bases":[890000,920000],"exploratory_replication_seed_base":900000,"exploratory_replication_topic":"invisible carrier replication","exploratory_topic":"invisible carrier development","generation":"cycle8_exact_visible_projection","inherited_spent_seed_bases":[760000,770000,780000,720000,730000,401000,402000,500000,61000,1120000,1130000,1140000,1150000,1160000,810000,820000,860000,870000],"ledger_hash":"dbf551dde1e3b41c7bb3daac4f6c5b242c4e0be1ecc726c571091e9b2e25b0cc","secondary_exploratory_seed_base":920000,"selection_rule":"Cycle 8 seeds 890000, 900000, 910000, and 920000 were assigned before any Cycle 8 text generation or detector look. Do not inspect 830000, 840000, or 850000. Do not inspect Cycle 7 reserved validation seed 880000 from Cycle 8. Do not retune on Cycle 6 formal residuals.","validation_development_seed_base":910000,"validation_topic":"invisible carrier validation"}
diff --git a/specs/fuckmark-user-visible-invariance-v1.contract.json b/specs/fuckmark-user-visible-invariance-v1.contract.json
new file mode 100644
index 00000000..461efb7f
--- /dev/null
+++ b/specs/fuckmark-user-visible-invariance-v1.contract.json
@@ -0,0 +1 @@
+{"allowed_hidden_modifications":{"product_authorized_carriers_v1":[],"research_carriers":"must be individually evidenced before product authorization"},"carrier_promotion_evidence":["unicode_properties","normalization_nfc_nfd_nfkc_nfkd","cf_strip_survival","whitespace_collapse_survival","combined_sanitizer_survival","gpt2_tokenization_effect","rendering_evidence_or_unknown","copy_paste_survival_or_unknown","protected_machine_span_safety","fresh_detector_reduction_is_not_a_substitute_for_visibility"],"clipboard_requirement":{"payload":"the_unicode_string_itself","roundtrip":"utf8_file_and_stdin_stdout_must_preserve_code_points"},"contract_hash":"5afd79586f82e31d0d673acbebebf0ac00804cff74b9f644f000bddfd3dc07d1","contract_id":"fuckmark-user-visible-invariance-v1","contract_version":"v1","failure_behavior":{"protected_machine_content":"do_not_insert_carriers_inside_span","uncertain_carrier_safety":"return_original","unsupported_domain":"return_original","visible_invariant_fail":"reject_candidate_or_return_original"},"forbidden_visible_modifications":["letter_or_word_rewrites","contraction_or_expansion","hyphenation_changes","apostrophe_or_quote_substitution","punctuation_insertion_or_deletion","visible_whitespace_changes","newline_or_layout_changes","homoglyphs","compatibility_or_fullwidth_variants","lookalike_punctuation"],"historical_reclassification":{"cycle6_formal":{"detector_result":"NONZERO_RESIDUAL_7_of_192","product_status":"PRODUCT_DISQUALIFIED","reason":"visible_ascii_space_insertion"},"cycle7_durable_visible_edits":{"product_status":"PRODUCT_DISQUALIFIED","reason":"visible_word_punctuation_or_layout_edits","scientific_status":"INSUFFICIENT_EVIDENCE"},"u200c_visible_projection":{"durability":"REJECTED_as_final_durable_mechanism","reason":"removed_by_cf_strip","visibility":"conceptually_product_aligned"}},"plain_text_requirement":{"css_or_font_tricks":"forbidden","html_overlays":"forbidden","images_or_canvas":"forbidden","metadata_outside_payload":"forbidden","viewer_plugins":"forbidden"},"priority":{"name":"exact_user_visible_text_preservation","outranks":["detector_score","detection_rate","evasion_rate","candidate_density","root_window_destruction","tokenizer_disruption","scheduler_quality","sanitizer_robustness","semantic_equivalence","human_fidelity"],"rank":0},"release_gating":{"empty_authorized_set":"fail_closed_return_original","product_authorized_carriers_required":true,"semantic_fidelity_insufficient":true,"visible_edit_fallback":"forbidden"},"renderer_assumptions":{"cross_platform_rendering":"unknown_unless_measured","no_special_renderer":true,"output":"ordinary_unicode_plain_text","required_environments":["terminal","text_editor","browser_text_box","clipboard","file"]},"sanitizer_assumptions":{"frozen_cycle6_variants":["raw","nfkc","cf_strip","nfkc_cf_strip"],"frozen_cycle7_additions":["ws_collapse","ws_collapse_nfkc_cf_strip"],"stress_only_not_frozen":["default_ignorable_removal","nonspacing_mark_removal"]},"scope":{"applies_to":["release_transform_registry","public_cli","product_transform_registry","cycle8_product_research_intended_for_eventual_release"],"does_not_rewrite":["frozen_historical_contracts","cycle4_formal_evidence","cycle6_formal_nonzero_residual","cycle7_visible_edit_research_artifacts"]},"status":"active_product_constraint","supported_input_domain":{"allowed_code_points":["U+0009","U+000A","U+000D","U+0020..U+007E"],"id":"ordinary-english-ascii-v1","outside_domain":"fail_closed_leave_text_unchanged"},"versioning_rules":{"historical_visible_edit_research":"may_replay_but_cannot_enter_release","successors":"new_filename_and_new_contract_id","this_contract":"immutable_once_used_for_formal_product_evidence"},"visible_projection":{"algorithm_version":"fuckmark-visible-projection-v1","deletions":"forbidden","letters_words_digits":"immutable","newlines":"immutable","original_visible_code_points":"intact_same_order","punctuation":"immutable","reordering":"forbidden","rule":"transformed must equal original with only insertions of approved non-rendering carriers","substitutions":"forbidden","tabs":"immutable","visible_ascii_spaces":"immutable"}}
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 7df0940c..092fef30 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -5,21 +5,54 @@
 
 import pytest
 
-from fuckmark.cli import main, process_text, read_pasted_text, transform_text
+from fuckmark.cli import RELEASE_CLI_ALGORITHM_VERSION, main, process_text, read_pasted_text, transform_text
+from fuckmark.product.invariants import validate_user_visible_invariants
+from fuckmark.product.visible_projection import is_carrier_insertion_v1
+from fuckmark.transforms.registry import (
+    historical_visible_edit_transform_registry,
+    release_transform_registry,
+)
+from fuckmark.transforms.schema import InvariantStatus
+
+
+VISIBLE_FIXTURES = (
+    "I do not agree.",
+    "We cannot continue.",
+    "You should not do that.",
+    "It's important to test this.",
+    "This is a proof of concept.",
+    "However, the result matters.",
+    "All of the examples are relevant.",
+)
+
+
+def test_cli_process_text_does_not_apply_visible_contractions() -> None:
+    source = "I do not agree and I cannot stay."
+    assert process_text(source) == source
+    assert transform_text(source).change_count == 0
+    assert transform_text(source).output_text == source
 
 
-def test_cli_process_text_uses_release_contractions_deterministically() -> None:
-    source = "I do not agree and I cannot stay."
-    expected = "I don't agree and I can't stay."
-    assert process_text(source) == expected
-    assert process_text(source) == expected
-    assert transform_text(source).change_count == 2
+@pytest.mark.parametrize("source", VISIBLE_FIXTURES)
+def test_cli_preserves_exact_visible_projection_on_contract_examples(source: str) -> None:
+    assert process_text(source) == source
+    assert is_carrier_insertion_v1(source, process_text(source), ())
+
 
+def test_historical_visible_edit_registry_still_contracts_for_replay() -> None:
+    source = "I do not agree."
+    registry = historical_visible_edit_transform_registry()
+    enumeration = registry.enumerate(source)
+    candidate = next(value for value in enumeration.candidates if value.rule_id == "contract-do-not")
+    result = registry.apply(enumeration, (candidate.candidate_id,))
+    assert result.output_text == "I don't agree."
+    report = validate_user_visible_invariants(source, result.output_text)
+    assert report.status is InvariantStatus.FAIL
 
-def test_cli_process_text_respects_protected_quoted_content() -> None:
+
+def test_cli_process_text_preserves_quoted_and_unquoted_visible_text() -> None:
     source = 'Keep "do not change this" but I do not agree.'
-    expected = "Keep \"do not change this\" but I don't agree."
-    assert process_text(source) == expected
+    assert process_text(source) == source
 
 
 def test_cli_process_text_preserves_text_when_no_candidate_is_eligible() -> None:
@@ -34,18 +67,19 @@ def test_cli_reads_multiline_paste_until_ok_line() -> None:
     assert "Finish with :done on its own line" in output.getvalue()
 
 
-def test_cli_main_processes_and_copies_result() -> None:
+def test_cli_main_processes_and_copies_unchanged_visible_text() -> None:
     source = StringIO("I do not agree.\nok\n")
     output = StringIO()
     copied: list[str] = []
     status = main(source, output, copied.append)
     assert status == 0
-    assert copied == ["I don't agree."]
+    assert copied == ["I do not agree."]
     rendered = output.getvalue()
     assert "FuckMark 0.2.0" in rendered
     assert "Processing..." in rendered
-    assert "Done — 1 change applied." in rendered
+    assert "visible text left unchanged" in rendered
     assert "Copied to clipboard." in rendered
+    assert "I don't agree." not in rendered
 
 
 def test_cli_main_copies_original_when_no_change_is_eligible() -> None:
@@ -55,7 +89,7 @@ def test_cli_main_copies_original_when_no_change_is_eligible() -> None:
     status = main(source, output, copied.append)
     assert status == 0
     assert copied == ["Already concise."]
-    assert "no eligible release-safe changes" in output.getvalue()
+    assert "visible text left unchanged" in output.getvalue()
 
 
 def test_cli_main_prints_result_if_clipboard_copy_fails() -> None:
@@ -69,7 +103,8 @@ def fail(_: str) -> None:
     status = main(source, output, fail, error_stream=errors)
     assert status == 2
     rendered = output.getvalue()
-    assert "I don't agree." in rendered
+    assert "I do not agree." in rendered
+    assert "I don't agree." not in rendered
     assert "clipboard copy failed" in errors.getvalue()
 
 
@@ -79,7 +114,8 @@ def test_cli_version_reports_project_and_algorithm_identity(capsys) -> None:
     assert result.value.code == 0
     rendered = capsys.readouterr().out
     assert "FuckMark 0.2.0" in rendered
-    assert "release-cli-v3" in rendered
+    assert RELEASE_CLI_ALGORITHM_VERSION == "release-cli-v4"
+    assert "release-cli-v4" in rendered
     assert "transform-registry-v6" in rendered
 
 
@@ -90,7 +126,7 @@ def test_cli_noninteractive_mode_writes_only_transformed_text(option) -> None:
     copied: list[str] = []
     status = main(source, output, copied.append, argv=option)
     assert status == 0
-    assert output.getvalue() == "I don't agree.\n"
+    assert output.getvalue() == "I do not agree.\n"
     assert copied == []
 
 
@@ -112,7 +148,7 @@ def test_cli_reads_file_and_atomically_writes_output(tmp_path: Path) -> None:
     assert main(output_stream=output, error_stream=errors, argv=(str(source), "--output", str(target))) == 0
     assert output.getvalue() == ""
     assert errors.getvalue() == ""
-    assert target.read_text(encoding="utf-8") == "I don't agree.\n"
+    assert target.read_text(encoding="utf-8") == "I do not agree.\n"
 
 
 def test_cli_refuses_to_overwrite_its_input_file(tmp_path: Path) -> None:
@@ -132,11 +168,11 @@ def test_cli_automatically_uses_stream_mode_for_a_pipe(monkeypatch) -> None:
     monkeypatch.setattr(sys, "stdout", output)
     monkeypatch.setattr(sys, "stderr", errors)
     assert main(argv=()) == 0
-    assert output.getvalue() == "I don't agree.\n"
+    assert output.getvalue() == "I do not agree.\n"
     assert errors.getvalue() == ""
 
 
-def test_cli_help_documents_file_pipe_clipboard_and_output(capsys) -> None:
+def test_cli_help_documents_file_pipe_clipboard_and_visible_contract(capsys) -> None:
     with pytest.raises(SystemExit) as result:
         main(argv=("--help",))
     assert result.value.code == 0
@@ -145,6 +181,15 @@ def test_cli_help_documents_file_pipe_clipboard_and_output(capsys) -> None:
     assert "--stdin" in rendered
     assert "--copy" in rendered
     assert "--output" in rendered
+    assert "user-visible" in rendered
+
+
+def test_release_registry_contains_no_visible_edit_transforms() -> None:
+    release_ids = {rule.rule_id for rule in release_transform_registry().rules}
+    historical_ids = {rule.rule_id for rule in historical_visible_edit_transform_registry().rules}
+    assert release_ids == set()
+    assert "contract-do-not" in historical_ids
+    assert historical_visible_edit_transform_registry().ruleset_hash != release_transform_registry().ruleset_hash
 
 
 def test_pyproject_installs_all_FuckMark_console_command_aliases() -> None:
diff --git a/tests/test_cycle8_carrier_screen_summary.py b/tests/test_cycle8_carrier_screen_summary.py
new file mode 100644
index 00000000..3b33a9d6
--- /dev/null
+++ b/tests/test_cycle8_carrier_screen_summary.py
@@ -0,0 +1,23 @@
+import json
+from pathlib import Path
+
+
+def test_cycle8_carrier_screen_summary_pins_sanitizer_and_tokenizer_claims() -> None:
+    path = Path(__file__).resolve().parents[1] / "specs" / "cycle8" / "carrier-screen-v1.summary.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    assert payload["gpt2_encoder"] == "gpt2"
+    assert payload["durable_track_count"] >= 1
+    assert "U+034F" in payload["durable_track_labels"]
+    assert "U+FE00" in payload["durable_track_labels"]
+    by_label = {row["label"]: row for row in payload["focus"]}
+    assert by_label["U+200C"]["classification"] == "DIAGNOSTIC_CF"
+    assert by_label["U+034F"]["classification"] == "DURABLE_TRACK_CANDIDATE"
+    assert by_label["U+034F"]["cf_strip_survives"] is True
+    assert by_label["U+034F"]["nfkc_stable"] is True
+    tokenizer = {row["label"]: row for row in payload["tokenizer"]}
+    cgj = tokenizer["U+034F"]
+    assert cgj["status"] == "VERIFIED"
+    assert cgj["space_visible_ok"] is True
+    assert cgj["space_metrics"]["ids_equal"] is False
+    assert cgj["space_metrics"]["token_count_delta"] > 0
+    assert tokenizer["U+200C"]["space_metrics"]["ids_equal"] is False
diff --git a/tests/test_cycle8_carriers.py b/tests/test_cycle8_carriers.py
new file mode 100644
index 00000000..051654b3
--- /dev/null
+++ b/tests/test_cycle8_carriers.py
@@ -0,0 +1,101 @@
+import json
+from pathlib import Path
+
+import pytest
+
+from fuckmark.cycle7.whitespace_collapse import collapse_horizontal_ascii_whitespace
+from fuckmark.cycle8.ledger import (
+    CYCLE8_EXPLORATORY_SEED_BASE,
+    CYCLE8_REPLICATION_SEED_BASE,
+    CYCLE8_VALIDATION_SEED_BASE,
+    assert_cycle8_development_seed,
+    cycle8_seed_ledger_hash,
+    cycle8_seed_ledger_payload,
+)
+from fuckmark.cycle8.registry import apply_all_candidates, cycle8_space_carrier_registry
+from fuckmark.cycle8.unicode_meta import (
+    audit_codepoints,
+    classify_carrier_hypothesis,
+    codepoint_properties,
+    iter_default_ignorable_codepoints_v1,
+)
+from fuckmark.hashing import sha256_json
+from fuckmark.product.visible_projection import is_carrier_insertion_v1
+from fuckmark.sanitizer_robustness import nfkc_normalize, strip_unicode_format_characters
+
+
+def test_cycle8_ledger_file_matches_embedded_payload() -> None:
+    path = Path(__file__).resolve().parents[1] / "specs" / "cycle8" / "fuckmark-cycle8-seed-ledger-v1.json"
+    disk = json.loads(path.read_text(encoding="utf-8"))
+    payload = {key: value for key, value in disk.items() if key != "ledger_hash"}
+    assert payload == cycle8_seed_ledger_payload()
+    assert disk["ledger_hash"] == cycle8_seed_ledger_hash() == sha256_json(payload)
+
+
+def test_cycle8_ledger_freezes_new_seeds_and_blocks_spent_history() -> None:
+    payload = cycle8_seed_ledger_payload()
+    assert payload["exploratory_development_seed_base"] == CYCLE8_EXPLORATORY_SEED_BASE == 890_000
+    assert payload["exploratory_replication_seed_base"] == CYCLE8_REPLICATION_SEED_BASE == 900_000
+    assert payload["validation_development_seed_base"] == CYCLE8_VALIDATION_SEED_BASE == 910_000
+    assert payload["confirmation_reserved_seed_bases"] == [830_000, 840_000, 850_000]
+    assert payload["cycle7_unseen_validation_seed_base"] == 880_000
+    assert cycle8_seed_ledger_hash()
+    assert_cycle8_development_seed(890_000, role="exploratory_development")
+    with pytest.raises(ValueError):
+        assert_cycle8_development_seed(760_000, role="exploratory_development")
+    with pytest.raises(ValueError):
+        assert_cycle8_development_seed(880_000, role="validation_development")
+    with pytest.raises(ValueError):
+        assert_cycle8_development_seed(830_000, role="exploratory_development")
+
+
+def test_u200c_is_diagnostic_cf_and_not_durable() -> None:
+    properties = codepoint_properties(0x200C)
+    assert properties["category"] == "Cf"
+    assert classify_carrier_hypothesis(properties) == "DIAGNOSTIC_CF"
+    assert properties["cf_strip_survives"] is False
+    source = "alpha beta"
+    transformed = "alpha \u200cbeta"
+    assert is_carrier_insertion_v1(source, transformed, (0x200C,))
+    assert strip_unicode_format_characters(transformed) == source
+
+
+def test_combining_grapheme_joiner_is_durable_track_on_frozen_sanitizers() -> None:
+    properties = codepoint_properties(0x034F)
+    assert properties["category"] == "Mn"
+    assert properties["default_ignorable"] is True
+    assert classify_carrier_hypothesis(properties) == "DURABLE_TRACK_CANDIDATE"
+    source = "I do not agree."
+    registry = cycle8_space_carrier_registry(0x034F, repeats=2)
+    transformed = apply_all_candidates(registry, source)
+    assert transformed != source
+    assert is_carrier_insertion_v1(source, transformed, (0x034F,))
+    assert strip_unicode_format_characters(transformed) == transformed
+    assert nfkc_normalize(transformed) == transformed
+    assert collapse_horizontal_ascii_whitespace(transformed) == transformed
+
+
+def test_nbsp_homoglyph_and_soft_hyphen_are_rejected_from_durable_track() -> None:
+    assert classify_carrier_hypothesis(codepoint_properties(0x00A0)) == "REJECTED_RENDERING_OR_CONTROL_RISK"
+    assert classify_carrier_hypothesis(codepoint_properties(0x00AD)) == "DIAGNOSTIC_CF"
+    assert classify_carrier_hypothesis(codepoint_properties(0x2010)) == "REJECTED_RENDERING_OR_CONTROL_RISK"
+
+
+def test_default_ignorable_scan_finds_non_cf_durable_candidates() -> None:
+    rows = audit_codepoints(iter_default_ignorable_codepoints_v1())
+    durable = {row["label"] for row in rows if row["classification"] == "DURABLE_TRACK_CANDIDATE"}
+    assert "U+034F" in durable
+    assert "U+FE00" in durable
+    assert "U+200C" not in durable
+
+
+def test_cgj_space_carrier_survives_utf8_file_roundtrip(tmp_path: Path) -> None:
+    source = "I do not agree.\n"
+    registry = cycle8_space_carrier_registry(0x034F, repeats=2)
+    transformed = apply_all_candidates(registry, source)
+    path = tmp_path / "roundtrip.txt"
+    path.write_text(transformed, encoding="utf-8")
+    loaded = path.read_text(encoding="utf-8")
+    assert loaded == transformed
+    assert is_carrier_insertion_v1(source, loaded, (0x034F,))
+    assert loaded.encode("utf-8").decode("utf-8") == transformed
diff --git a/tests/test_cycle8_detector_evidence.py b/tests/test_cycle8_detector_evidence.py
new file mode 100644
index 00000000..4c9afee7
--- /dev/null
+++ b/tests/test_cycle8_detector_evidence.py
@@ -0,0 +1,86 @@
+import json
+from pathlib import Path
+
+from fuckmark.hashing import sha256_json
+
+
+def test_cycle8_chrome_render_pins_u034f_invisible_and_u200c_visible() -> None:
+    path = Path(__file__).resolve().parents[1] / "specs" / "cycle8" / "chrome-render-v1.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    body = {key: value for key, value in payload.items() if key != "artifact_hash"}
+    assert payload["artifact_hash"] == sha256_json(body)
+    rows = {row["arm_id"]: row for row in payload["rows"]}
+    assert rows["u034f-space-x1"]["status"] == "VERIFIED"
+    assert rows["u034f-space-x1"]["equal"] is True
+    assert rows["u034f-space-x8"]["status"] == "VERIFIED"
+    assert rows["ufe00-space-x1"]["status"] == "VERIFIED"
+    assert rows["u200c-space-x1"]["status"] == "REJECTED"
+    assert rows["u200c-space-x1"]["equal"] is False
+
+
+def test_cycle8_seed_890000_detector_compare_is_development_only() -> None:
+    path = Path(__file__).resolve().parents[1] / "evidence" / "cycle8-exploratory-890000-2026-08-25" / "detector-compare.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    body = {key: value for key, value in payload.items() if key != "artifact_hash"}
+    assert payload["artifact_hash"] == sha256_json(body)
+    assert payload["seed_base"] == 890000
+    assert payload["visible_pass_rate"] == "32/32"
+    assert payload["detector_access_used_for_selection"] is False
+    identity = payload["summaries"]["identity"]
+    u034f = payload["summaries"]["u034f-space-x1"]
+    u200c = payload["summaries"]["u200c-space-x1"]
+    assert identity["raw_watermarked_detected"] == 3
+    assert identity["raw_unwatermarked_detected"] == 0
+    assert u034f["raw_watermarked_detected"] == 0
+    assert u034f["raw_unwatermarked_detected"] == 0
+    assert u034f["cf_strip_watermarked_detected"] == 0
+    assert u034f["ws_collapse_watermarked_detected"] == 0
+    assert u200c["raw_watermarked_detected"] == 0
+    assert u200c["cf_strip_watermarked_detected"] == 3
+    decision = json.loads(
+        (Path(__file__).resolve().parents[1] / "evidence" / "cycle8-exploratory-890000-2026-08-25" / "decision.json").read_text(
+            encoding="utf-8"
+        )
+    )
+    assert decision["decision"] == "PROMISING_DEVELOPMENT"
+    assert decision["product_gate"] == "VISIBLE_INVARIANT_PASS"
+    assert "no Cycle 8 detector scores" not in " ".join(decision["reasons"])
+
+
+def test_cycle8_seed_900000_replicates_u034f_without_unwatermarked_inflation() -> None:
+    path = Path(__file__).resolve().parents[1] / "evidence" / "cycle8-replication-900000-2026-08-25" / "detector-compare.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    body = {key: value for key, value in payload.items() if key != "artifact_hash"}
+    assert payload["artifact_hash"] == sha256_json(body)
+    assert payload["seed_base"] == 900000
+    assert payload["visible_pass_rate"] == "32/32"
+    identity = payload["summaries"]["identity"]
+    u034f = payload["summaries"]["u034f-space-x1"]
+    u200c = payload["summaries"]["u200c-space-x1"]
+    assert identity["raw_watermarked_detected"] == 4
+    assert identity["raw_unwatermarked_detected"] == 0
+    assert u034f["raw_watermarked_detected"] == 0
+    assert u034f["cf_strip_watermarked_detected"] == 0
+    assert u200c["cf_strip_watermarked_detected"] == 4
+    overflow = [
+        row["arms"]["u034f-space-x8"]["tokenizer"]["transformed_token_count"]
+        for row in payload["geometry_rows"]
+    ]
+    assert max(overflow) > 1024
+    assert max(row["arms"]["u034f-space-x1"]["tokenizer"]["transformed_token_count"] for row in payload["geometry_rows"]) < 1024
+
+
+def test_cycle8_seed_910000_validation_matches_u034f_direction() -> None:
+    path = Path(__file__).resolve().parents[1] / "evidence" / "cycle8-validation-910000-2026-08-25" / "detector-compare.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    body = {key: value for key, value in payload.items() if key != "artifact_hash"}
+    assert payload["artifact_hash"] == sha256_json(body)
+    assert payload["seed_base"] == 910000
+    assert payload["visible_pass_rate"] == "32/32"
+    identity = payload["summaries"]["identity"]
+    u034f = payload["summaries"]["u034f-space-x1"]
+    assert identity["raw_watermarked_detected"] == 3
+    assert u034f["raw_watermarked_detected"] == 0
+    assert u034f["cf_strip_watermarked_detected"] == 0
+    assert identity["raw_unwatermarked_detected"] == 0
+    assert u034f["raw_unwatermarked_detected"] == 0
diff --git a/tests/test_cycle8_fixture_compare.py b/tests/test_cycle8_fixture_compare.py
new file mode 100644
index 00000000..799d3dbd
--- /dev/null
+++ b/tests/test_cycle8_fixture_compare.py
@@ -0,0 +1,73 @@
+import json
+from pathlib import Path
+
+from fuckmark.cycle8.compare import (
+    CYCLE8_U034F_SPACE_ARM_ID,
+    CYCLE8_U200C_SPACE_ARM_ID,
+    measure_carrier_arm,
+    run_fixture_compare,
+)
+from fuckmark.cycle8.decision import INSUFFICIENT_EVIDENCE, classify_fixture_compare
+from fuckmark.cycle8.tokenizer_screen import GPT2_FIXTURE
+from fuckmark.hashing import sha256_json
+from fuckmark.product.domain import is_supported_product_domain_v1
+from fuckmark.cycle8.scoreboard import ProductGate
+
+
+def test_github_ci_cli_e2e_expects_unchanged_visible_text() -> None:
+    text = (Path(__file__).resolve().parents[1] / ".github" / "workflows" / "ci.yml").read_text(encoding="utf-8")
+    assert "I don't agree" not in text
+    assert "I can't stay" not in text
+    assert 'test "$output" = "I do not agree and I cannot stay."' in text
+    assert 'test "$(printf \'I do not agree.\\n\' | FuckMark)" = "I do not agree."' in text
+
+
+def test_cycle8_fixture_compare_passes_visible_projection_without_encoder() -> None:
+    report = run_fixture_compare(encoder=None)
+    assert report["visible_pass_rate"] == "20/20"
+    decision = classify_fixture_compare(report)
+    assert decision["product_gate"] == ProductGate.PASS.value
+    assert decision["decision"] == INSUFFICIENT_EVIDENCE
+    screen = next(row for row in report["rows"] if row["source_sample_id"] == "gpt2-screen")
+    u034f = screen["arms"][CYCLE8_U034F_SPACE_ARM_ID]
+    u200c = screen["arms"][CYCLE8_U200C_SPACE_ARM_ID]
+    assert u034f["visible_ok"] is True
+    assert u034f["selected_count"] > 0
+    assert u034f["sanitizers"]["cf_strip"]["equals_transformed"] is True
+    assert u034f["sanitizers"]["nfkc"]["equals_transformed"] is True
+    assert u034f["sanitizers"]["ws_collapse"]["equals_transformed"] is True
+    assert u200c["sanitizers"]["cf_strip"]["equals_source"] is True
+    quote = next(row for row in report["rows"] if row["source_sample_id"] == "quote-interior")
+    assert quote["arms"][CYCLE8_U034F_SPACE_ARM_ID]["protected_blocked_count"] > 0
+
+
+def test_cycle8_url_fixture_keeps_protected_machine_text() -> None:
+    source = "See https://example.com/do-not-touch and continue the notes."
+    assert is_supported_product_domain_v1(source)
+    measurement = measure_carrier_arm(
+        arm_id=CYCLE8_U034F_SPACE_ARM_ID,
+        source_sample_id="url-protected",
+        source_text=source,
+    )
+    transformed = str(measurement["transformed_text"])
+    assert "https://example.com/do-not-touch" in transformed.replace("\u034f", "")
+    assert measurement["visible_ok"] is True
+    assert measurement["selected_count"] > 0
+
+
+def test_cycle8_committed_fixture_compare_pins_visibility_and_tokenizer() -> None:
+    path = Path(__file__).resolve().parents[1] / "specs" / "cycle8" / "fixture-compare-v1.json"
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    body = {key: value for key, value in payload.items() if key != "artifact_hash"}
+    assert payload["artifact_hash"] == sha256_json(body)
+    assert payload["visible_pass_rate"] == "20/20"
+    assert payload["encoder"] == "gpt2"
+    screen = next(row for row in payload["rows"] if row["source_sample_id"] == "gpt2-screen")
+    u034f = screen["arms"][CYCLE8_U034F_SPACE_ARM_ID]
+    assert u034f["tokenizer"]["ids_equal"] is False
+    assert u034f["tokenizer"]["token_count_delta"] > 0
+    decision_path = Path(__file__).resolve().parents[1] / "specs" / "cycle8" / "fixture-decision-v1.json"
+    decision = json.loads(decision_path.read_text(encoding="utf-8"))
+    assert decision["product_gate"] == "VISIBLE_INVARIANT_PASS"
+    assert decision["decision"] == INSUFFICIENT_EVIDENCE
+    assert GPT2_FIXTURE.startswith("The researchers")
diff --git a/tests/test_development_surface_spacing_rules.py b/tests/test_development_surface_spacing_rules.py
index c72aa59e..9d33410d 100644
--- a/tests/test_development_surface_spacing_rules.py
+++ b/tests/test_development_surface_spacing_rules.py
@@ -152,7 +152,8 @@ def test_surface_rules_remain_development_only() -> None:
     default_hashes = {rule.rule_hash for rule in default_transform_registry().rules}
     release_hashes = {rule.rule_hash for rule in release_transform_registry().rules}
     contraction_hashes = {rule.rule_hash for rule in default_contraction_rules()}
-    assert default_hashes == release_hashes == contraction_hashes
+    assert default_hashes == contraction_hashes
+    assert release_hashes == set()
     assert surface_hashes.isdisjoint(default_hashes)
     assert surface_hashes <= {rule.rule_hash for rule in development_transform_registry().rules}
 
diff --git a/tests/test_effectiveness_profile.py b/tests/test_effectiveness_profile.py
index e2b90b63..e7c18d8f 100644
--- a/tests/test_effectiveness_profile.py
+++ b/tests/test_effectiveness_profile.py
@@ -44,14 +44,7 @@ def test_effectiveness_registry_is_isolated_from_development_and_release() -> No
     assert added_ids <= effectiveness_ids
     assert added_ids.isdisjoint(development_ids)
     assert added_ids.isdisjoint(release_ids)
-    assert release_ids == {
-        "contract-cannot",
-        "contract-did-not",
-        "contract-do-not",
-        "contract-does-not",
-        "contract-should-not",
-        "contract-will-not",
-    }
+    assert release_ids == set()
 
 
 def test_effectiveness_registry_applies_copula_contraction_without_losing_negation() -> None:
diff --git a/tests/test_product_rendering.py b/tests/test_product_rendering.py
new file mode 100644
index 00000000..39b31922
--- /dev/null
+++ b/tests/test_product_rendering.py
@@ -0,0 +1,50 @@
+import json
+from pathlib import Path
+
+import pytest
+
+from fuckmark.cycle8_hf import main as cycle8_hf_main
+from fuckmark.product.rendering import _html_page
+
+
+def test_html_page_does_not_close_script_on_ascii_terminator() -> None:
+    page = _html_page("ok</script><img src=x>more")
+    _, script = page.split("<script>", 1)
+    body, suffix = script.rsplit("</script>", 1)
+    assert suffix.startswith("</body>")
+    assert "</script>" not in body
+    assert "<img" not in body
+    assert "\\u003c/script\\u003e" in body
+    assert "textContent=" in body
+
+
+def test_require_gpt2_encoder_fails_closed_when_tiktoken_missing(monkeypatch) -> None:
+    import fuckmark.cycle8.tokenizer_screen as module
+
+    monkeypatch.setattr(module, "load_gpt2_encoder", lambda: None)
+    with pytest.raises(RuntimeError, match="gpt2 encoder is required"):
+        module.require_gpt2_encoder()
+
+
+def test_cycle8_hf_writes_fixture_compare_without_gpt2_encoder(monkeypatch, tmp_path: Path) -> None:
+    import fuckmark.cycle8.tokenizer_screen as module
+
+    monkeypatch.setattr(module, "load_gpt2_encoder", lambda: None)
+    destination = tmp_path / "detector-compare.json"
+    assert cycle8_hf_main(["--skip-detector", "--detector-json", str(destination)]) == 0
+    fixture = json.loads((tmp_path / "fixture-compare.json").read_text(encoding="utf-8"))
+    assert fixture["visible_pass_rate"] == "20/20"
+    assert fixture["encoder"] == "unavailable"
+    assert (tmp_path / "decision.json").is_file()
+    assert not destination.is_file()
+
+
+def test_pinned_cycle8_spec_writers_require_gpt2_encoder() -> None:
+    root = Path(__file__).resolve().parents[1]
+    fixture_tool = (root / "tools" / "cycle8_fixture_compare.py").read_text(encoding="utf-8")
+    screen_tool = (root / "tools" / "cycle8_carrier_screen.py").read_text(encoding="utf-8")
+    harness = (root / "fuckmark" / "cycle8_hf.py").read_text(encoding="utf-8")
+    assert "require_gpt2_encoder()" in fixture_tool
+    assert "require_gpt2_encoder()" in screen_tool
+    assert "require_gpt2_encoder()" not in harness
+    assert "load_gpt2_encoder()" in harness
diff --git a/tests/test_product_visible_invariance.py b/tests/test_product_visible_invariance.py
new file mode 100644
index 00000000..e76b2b63
--- /dev/null
+++ b/tests/test_product_visible_invariance.py
@@ -0,0 +1,129 @@
+import json
+from pathlib import Path
+
+import pytest
+
+from fuckmark.cycle7.whitespace_collapse import collapse_horizontal_ascii_whitespace
+from fuckmark.hashing import sha256_json
+from fuckmark.product.carriers import rule_preserves_visible_projection, space_carrier_rule
+from fuckmark.product.contract import load_product_contract, product_contract_hash, product_contract_payload
+from fuckmark.product.domain import is_supported_product_domain_v1
+from fuckmark.product.invariants import UserVisibleInvariantReason, validate_user_visible_invariants
+from fuckmark.product.registry import ProductTransformRegistry, product_transform_registry
+from fuckmark.product.visible_projection import is_carrier_insertion_v1, project_visible_v1
+from fuckmark.sanitizer_robustness import nfkc_normalize, strip_unicode_format_characters
+from fuckmark.transforms.registry import historical_visible_edit_transform_registry, release_transform_registry
+from fuckmark.transforms.rules import default_contraction_rules
+from fuckmark.transforms.schema import CandidateRejectionReason, InvariantStatus
+
+
+def test_product_contract_file_matches_embedded_payload() -> None:
+    contract = load_product_contract()
+    payload = {key: value for key, value in contract.items() if key != "contract_hash"}
+    assert payload == product_contract_payload()
+    assert contract["contract_hash"] == product_contract_hash() == sha256_json(payload)
+    path = Path(__file__).resolve().parents[1] / "specs" / "fuckmark-user-visible-invariance-v1.contract.json"
+    disk = json.loads(path.read_text(encoding="utf-8"))
+    assert disk == contract
+
+
+def test_load_product_contract_uses_embedded_payload_without_checkout_file(monkeypatch, tmp_path: Path) -> None:
+    from fuckmark.product import contract as contract_module
+
+    monkeypatch.setattr(contract_module, "PRODUCT_CONTRACT_PATH", tmp_path / "missing-contract.json")
+    contract = contract_module.load_product_contract()
+    payload = {key: value for key, value in contract.items() if key != "contract_hash"}
+    assert payload == product_contract_payload()
+    assert contract["contract_hash"] == product_contract_hash()
+
+
+def test_load_product_contract_rejects_mismatched_checkout_file(monkeypatch, tmp_path: Path) -> None:
+    from fuckmark.product import contract as contract_module
+
+    path = tmp_path / "fuckmark-user-visible-invariance-v1.contract.json"
+    path.write_text("{}", encoding="utf-8")
+    monkeypatch.setattr(contract_module, "PRODUCT_CONTRACT_PATH", path)
+    with pytest.raises(ValueError, match="does not match embedded v1 payload"):
+        contract_module.load_product_contract()
+
+
+def test_visible_projection_rejects_contractions_spaces_and_punctuation() -> None:
+    cases = (
+        ("I do not agree.", "I don't agree."),
+        ("We cannot continue.", "We can't continue."),
+        ("toward the lake", "towards the lake"),
+        ("proof of concept", "proof-of-concept"),
+        ("well known", "well-known"),
+        ("However the result matters.", "However, the result matters."),
+        ("one space", "one  space"),
+        ("line one\nline two", "line one line two"),
+        ("It's fine.", "It\u2019s fine."),
+    )
+    for original, transformed in cases:
+        report = validate_user_visible_invariants(original, transformed)
+        assert report.status is InvariantStatus.FAIL
+        assert report.reasons == (UserVisibleInvariantReason.USER_VISIBLE_TEXT_CHANGED,)
+
+
+def test_visible_projection_accepts_approved_carrier_insertions_only() -> None:
+    original = "I do not agree."
+    transformed = "I do \u034fnot agree."
+    assert is_carrier_insertion_v1(original, transformed, (0x034F,))
+    assert project_visible_v1(transformed, (0x034F,)) == original
+    assert validate_user_visible_invariants(original, transformed, (0x034F,)).status is InvariantStatus.PASS
+    assert validate_user_visible_invariants(original, transformed).status is InvariantStatus.FAIL
+
+
+def test_product_registry_refuses_visible_edit_rules() -> None:
+    with pytest.raises(ValueError, match="visible-edit"):
+        product_transform_registry(rules=default_contraction_rules())
+    registry = ProductTransformRegistry(default_contraction_rules())
+    enumeration = registry.enumerate("I do not agree.")
+    assert enumeration.candidates == ()
+    assert any(value.reason is CandidateRejectionReason.USER_VISIBLE_TEXT_CHANGED for value in enumeration.rejections)
+
+
+def test_release_registry_is_empty_product_registry() -> None:
+    registry = release_transform_registry()
+    assert registry.rules == ()
+    text = "I do not agree. We cannot continue."
+    assert registry.enumerate(text).candidates == ()
+    assert historical_visible_edit_transform_registry().ruleset_hash != registry.ruleset_hash
+
+
+def test_product_domain_rejects_non_ascii_and_cli_leaves_it_unchanged() -> None:
+    text = "cafe\u0301 already combines."
+    assert not is_supported_product_domain_v1(text)
+    assert release_transform_registry().enumerate(text).candidates == ()
+
+
+def test_space_carrier_rule_round_trips_projection_and_survives_cf_strip() -> None:
+    rule = space_carrier_rule(0x034F, 2)
+    assert rule_preserves_visible_projection(rule, (0x034F,))
+    original = "do not"
+    transformed = "do \u034f\u034fnot"
+    assert is_carrier_insertion_v1(original, transformed, (0x034F,))
+    assert strip_unicode_format_characters(transformed) == transformed
+    assert nfkc_normalize(transformed) == transformed
+    assert collapse_horizontal_ascii_whitespace(transformed) == transformed
+
+
+def test_protected_url_and_number_and_path_are_not_carrier_sites() -> None:
+    from fuckmark.cycle8.registry import cycle8_space_carrier_registry
+
+    registry = cycle8_space_carrier_registry(0x034F)
+    text = "See https://example.com/a-b and 42 and /tmp/foo.txt in the notes."
+    enumeration = registry.enumerate(text)
+    for candidate in enumeration.candidates:
+        span = text[candidate.start:candidate.end]
+        assert "https://example.com" not in text[max(0, candidate.start - 30):candidate.end + 30] or span == " "
+        assert candidate.start >= text.index("See")
+    applied = text
+    if enumeration.candidates:
+        from fuckmark.cycle8.registry import apply_all_candidates
+
+        applied = apply_all_candidates(registry, text)
+    assert "https://example.com/a-b" in applied.replace("\u034f", "")
+    assert "42" in applied.replace("\u034f", "")
+    assert "/tmp/foo.txt" in applied.replace("\u034f", "")
+    assert is_carrier_insertion_v1(text, applied, (0x034F,))
diff --git a/tests/test_source_grounded_lexical_release.py b/tests/test_source_grounded_lexical_release.py
index 5642e95a..df3cace6 100644
--- a/tests/test_source_grounded_lexical_release.py
+++ b/tests/test_source_grounded_lexical_release.py
@@ -12,6 +12,7 @@
 from fuckmark.transforms.fidelity_verification import (
     FidelityEvidenceVerificationError,
     LexicalPromotionEvidence,
+    source_verified_historical_visible_edit_transform_registry,
     source_verified_release_transform_registry,
     verify_lexical_promotion_evidence,
 )
@@ -97,11 +98,20 @@ def _promotion(human_audit=None):
     )
 
 
-def test_source_grounded_release_replays_all_evidence_before_enabling_lexical_rule() -> None:
+def test_source_grounded_release_rejects_visible_lexical_promotion() -> None:
     promotion = _promotion()
     summary = verify_lexical_promotion_evidence(promotion, _tokenizer)
     assert summary.evidence_summary_complete
-    registry = source_verified_release_transform_registry(
+    with pytest.raises(FidelityEvidenceVerificationError, match="user-visible text"):
+        source_verified_release_transform_registry(
+            (promotion,),
+            {promotion.model_tokenizer_identity.identity_hash: _tokenizer},
+        )
+
+
+def test_source_grounded_historical_visible_edit_registry_still_enables_lexical_replay() -> None:
+    promotion = _promotion()
+    registry = source_verified_historical_visible_edit_transform_registry(
         (promotion,),
         {promotion.model_tokenizer_identity.identity_hash: _tokenizer},
     )
diff --git a/tests/test_synthid_eligible_geometry.py b/tests/test_synthid_eligible_geometry.py
index ffd55c0c..bc7c2701 100644
--- a/tests/test_synthid_eligible_geometry.py
+++ b/tests/test_synthid_eligible_geometry.py
@@ -16,7 +16,7 @@
 from fuckmark.experiments.synthid_smoke import SynthIDSmokePrompt
 from fuckmark.hashing import sha256_text
 from fuckmark.public_eligibility import build_huggingface_public_eligibility
-from fuckmark.transforms import release_transform_registry
+from fuckmark.transforms import historical_visible_edit_transform_registry
 
 
 class _FakeBackend:
@@ -86,7 +86,7 @@ def test_eligible_geometry_pilot_builds_both_bases_before_scoring() -> None:
     report = run_synthid_eligible_geometry_pilot(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1, 2),
         schedule_seed=100,
     )
@@ -112,7 +112,7 @@ def test_eligible_geometry_report_fails_closed_on_tamper() -> None:
     report = run_synthid_eligible_geometry_pilot(
         (prompt,),
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
     )
     with pytest.raises(ValueError, match="variant_hash"):
@@ -128,5 +128,5 @@ def test_eligible_geometry_rejects_duplicate_prompt_ids() -> None:
         run_synthid_eligible_geometry_pilot(
             (prompt, replace(prompt, seed=2)),
             backend,
-            release_transform_registry(),
+            historical_visible_edit_transform_registry(),
         )
diff --git a/tests/test_synthid_geometry.py b/tests/test_synthid_geometry.py
index 70880176..edf57f52 100644
--- a/tests/test_synthid_geometry.py
+++ b/tests/test_synthid_geometry.py
@@ -14,7 +14,7 @@
 )
 from fuckmark.experiments.synthid_smoke import SynthIDSmokePrompt
 from fuckmark.hashing import sha256_text
-from fuckmark.transforms import SchedulePolicy, release_transform_registry
+from fuckmark.transforms import SchedulePolicy, historical_visible_edit_transform_registry
 
 
 class _FakeBackend:
@@ -61,7 +61,7 @@ def _prompts() -> tuple[SynthIDSmokePrompt, ...]:
 
 def test_public_candidate_coverage_uses_tokenizer_geometry_only() -> None:
     backend = _FakeBackend(expected_generate_calls=0)
-    registry = release_transform_registry()
+    registry = historical_visible_edit_transform_registry()
     enumeration = registry.enumerate(
         "We do not panic. We should not drift. We cannot ignore evidence."
     )
@@ -82,7 +82,7 @@ def test_geometry_pilot_builds_matched_random_vs_greedy_pairs_before_scoring() -
     report = run_synthid_geometry_pilot(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1, 2),
         random_seeds=(101, 102, 103, 104),
         greedy_seed=100,
@@ -113,7 +113,7 @@ def test_geometry_pilot_keeps_ineligible_sources_in_report() -> None:
     report = run_synthid_geometry_pilot(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         random_seeds=(1, 2),
     )
@@ -130,7 +130,7 @@ def test_geometry_report_and_variants_fail_closed_on_tamper() -> None:
     report = run_synthid_geometry_pilot(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         random_seeds=(1, 2),
     )
@@ -147,5 +147,5 @@ def test_geometry_pilot_rejects_duplicate_prompt_ids() -> None:
         run_synthid_geometry_pilot(
             (prompt, replace(prompt, seed=2)),
             backend,
-            release_transform_registry(),
+            historical_visible_edit_transform_registry(),
         )
diff --git a/tests/test_synthid_geometry_headroom.py b/tests/test_synthid_geometry_headroom.py
index 3baf7f14..e0940e52 100644
--- a/tests/test_synthid_geometry_headroom.py
+++ b/tests/test_synthid_geometry_headroom.py
@@ -12,12 +12,12 @@
 from fuckmark.transforms import (
     KeyBlindScheduleInput,
     ScheduleGeometryMode,
-    release_transform_registry,
+    historical_visible_edit_transform_registry,
 )
 
 
 def _inputs():
-    registry = release_transform_registry()
+    registry = historical_visible_edit_transform_registry()
     enumeration = registry.enumerate(
         "We do not panic. We should not drift. We cannot ignore evidence."
     )
@@ -77,7 +77,7 @@ def test_headroom_detects_rank_and_greedy_disagreement() -> None:
 def test_headroom_marks_empty_eligible_geometry_without_forcing_schedule() -> None:
     all_input, eligible_input = _inputs()
     empty = KeyBlindScheduleInput.from_enumeration(
-        release_transform_registry().enumerate(
+        historical_visible_edit_transform_registry().enumerate(
             "We do not panic. We should not drift. We cannot ignore evidence."
         ),
         coverage_intervals={candidate.candidate_id: () for candidate in eligible_input.candidates},
@@ -101,7 +101,7 @@ def test_headroom_report_is_content_addressed() -> None:
 
 
 def test_source_builder_uses_public_eligibility_geometry() -> None:
-    registry = release_transform_registry()
+    registry = historical_visible_edit_transform_registry()
     vocabulary = {}
 
     def tokenize(text: str):
@@ -127,7 +127,7 @@ def tokenize(text: str):
 
 def test_headroom_rejects_mismatched_candidate_geometry() -> None:
     all_input, _ = _inputs()
-    registry = release_transform_registry()
+    registry = historical_visible_edit_transform_registry()
     other_enumeration = registry.enumerate(
         "We do not stop. We should not wait. We cannot ignore facts."
     )
diff --git a/tests/test_synthid_high_repetition_detector.py b/tests/test_synthid_high_repetition_detector.py
index 321febed..2a967b62 100644
--- a/tests/test_synthid_high_repetition_detector.py
+++ b/tests/test_synthid_high_repetition_detector.py
@@ -18,7 +18,7 @@
     _build_source_manifest,
     _validate_plan_against_source_manifest,
 )
-from fuckmark.transforms import release_transform_registry
+from fuckmark.transforms import historical_visible_edit_transform_registry
 
 
 class _PlanBackend:
@@ -85,7 +85,7 @@ def test_high_repetition_plan_is_frozen_before_detector_scoring() -> None:
     plan = build_high_repetition_detector_plan(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         schedule_seed=41,
     )
@@ -104,7 +104,7 @@ def test_high_repetition_pilot_scores_only_after_every_selection_is_frozen() ->
     plan, report = run_synthid_high_repetition_detector_pilot(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         schedule_seed=42,
     )
@@ -122,7 +122,7 @@ def test_high_repetition_plan_and_report_fail_closed_on_tamper() -> None:
     plan, report = run_synthid_high_repetition_detector_pilot(
         _prompts(),
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
     )
     with pytest.raises(ValueError, match="plan_hash"):
@@ -138,7 +138,7 @@ def test_high_repetition_scoring_rejects_backend_identity_drift() -> None:
     plan = build_high_repetition_detector_plan(
         _prompts(),
         _PlanBackend(expected_generate_calls=8),
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
     )
     backend = _ScoringBackend(expected_generate_calls=0)
@@ -155,7 +155,7 @@ def test_source_manifest_retains_all_sources_and_reconstructs_the_same_q4() -> N
     plan = build_high_repetition_detector_plan(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         schedule_seed=43,
     )
diff --git a/tests/test_synthid_repetition_strata.py b/tests/test_synthid_repetition_strata.py
index 3469cc37..b668e968 100644
--- a/tests/test_synthid_repetition_strata.py
+++ b/tests/test_synthid_repetition_strata.py
@@ -11,7 +11,7 @@
     run_synthid_repetition_strata,
 )
 from fuckmark.experiments.synthid_smoke import SynthIDSmokePrompt
-from fuckmark.transforms import release_transform_registry
+from fuckmark.transforms import historical_visible_edit_transform_registry
 
 
 class _FakeBackend:
@@ -59,7 +59,7 @@ def test_repetition_strata_retains_every_generated_source_and_balances_rank_quar
     report = run_synthid_repetition_strata(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         schedule_seed=12,
     )
@@ -89,7 +89,7 @@ def test_repetition_strata_high_quartile_has_no_less_repetition_than_low_quartil
     report = run_synthid_repetition_strata(
         _prompts(),
         _FakeBackend(expected_generate_calls=8),
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
     )
     for label in (GeometryLabel.CONTROL, GeometryLabel.WATERMARKED):
@@ -104,7 +104,7 @@ def test_repetition_strata_report_fails_closed_on_tamper() -> None:
     report = run_synthid_repetition_strata(
         _prompts(),
         _FakeBackend(expected_generate_calls=8),
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
     )
     with pytest.raises(ValueError, match="report_hash"):
@@ -119,5 +119,5 @@ def test_repetition_strata_rejects_duplicate_prompt_ids() -> None:
         run_synthid_repetition_strata(
             (prompt, replace(prompt, seed=2)),
             _FakeBackend(expected_generate_calls=0),
-            release_transform_registry(),
+            historical_visible_edit_transform_registry(),
         )
diff --git a/tests/test_synthid_schedule_stress.py b/tests/test_synthid_schedule_stress.py
index 0f494ab5..8d93871f 100644
--- a/tests/test_synthid_schedule_stress.py
+++ b/tests/test_synthid_schedule_stress.py
@@ -12,7 +12,7 @@
 )
 from fuckmark.experiments.synthid_smoke import SynthIDSmokePrompt
 from fuckmark.hashing import sha256_text
-from fuckmark.transforms import SchedulePolicy, release_transform_registry
+from fuckmark.transforms import SchedulePolicy, historical_visible_edit_transform_registry
 
 
 class _StressBackend:
@@ -58,7 +58,7 @@ def test_schedule_stress_finds_exact_public_geometry_headroom() -> None:
     report = run_synthid_schedule_stress(
         prompts,
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1, 2),
         random_seeds=(201, 202, 203, 204),
         spacing_seed=200,
@@ -90,7 +90,7 @@ def test_schedule_stress_keeps_ineligible_sources() -> None:
     report = run_synthid_schedule_stress(
         (prompt,),
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         random_seeds=(1, 2),
     )
@@ -108,7 +108,7 @@ def test_schedule_stress_report_fails_closed_on_tamper() -> None:
     report = run_synthid_schedule_stress(
         (prompt,),
         backend,
-        release_transform_registry(),
+        historical_visible_edit_transform_registry(),
         budgets=(1,),
         random_seeds=(1, 2),
     )
@@ -125,5 +125,5 @@ def test_schedule_stress_rejects_duplicate_prompt_ids() -> None:
         run_synthid_schedule_stress(
             (prompt, replace(prompt, seed=8)),
             backend,
-            release_transform_registry(),
+            historical_visible_edit_transform_registry(),
         )
diff --git a/tests/test_synthid_smoke.py b/tests/test_synthid_smoke.py
index 0c30b546..8d9ced1b 100644
--- a/tests/test_synthid_smoke.py
+++ b/tests/test_synthid_smoke.py
@@ -9,6 +9,22 @@
     run_synthid_smoke,
 )
 from fuckmark.hashing import sha256_text
+from fuckmark.transforms.registry import historical_visible_edit_transform_registry
+
+
+def _historical_visible_edit(text: str) -> str:
+    registry = historical_visible_edit_transform_registry()
+    enumeration = registry.enumerate(text)
+    selected = []
+    occupied_until = 0
+    for candidate in enumeration.candidates:
+        if candidate.start < occupied_until:
+            continue
+        selected.append(candidate.candidate_id)
+        occupied_until = candidate.end
+    if not selected:
+        return text
+    return registry.apply(enumeration, tuple(selected)).output_text
 
 
 class _FakeBackend:
@@ -50,15 +66,23 @@ def test_synthid_smoke_measures_paired_watermark_degradation_and_control_shift()
     assert report.summary.pristine_control_detection_rate == 0.0
     assert report.summary.transformed_control_detection_rate == 0.0
     assert report.summary.pristine_watermark_detection_rate == 1.0
+    assert report.summary.transformed_watermark_detection_rate == 1.0
+    assert report.summary.watermark_detection_rate_drop == 0.0
+    assert report.summary.mean_watermark_score_drop == pytest.approx(0.0)
+    assert report.summary.median_watermark_score_drop == pytest.approx(0.0)
+    assert report.summary.mean_control_score_shift == pytest.approx(0.0)
+    assert report.summary.control_transform_rate == 0.0
+    assert report.summary.watermark_transform_rate == 0.0
+    assert not any(value.watermark_changed for value in report.results)
+    assert not any(value.control_changed for value in report.results)
+
+
+def test_historical_visible_edit_smoke_still_contracts_when_requested_explicitly() -> None:
+    report = run_synthid_smoke(_prompts(), _FakeBackend(), transform=_historical_visible_edit)
     assert report.summary.transformed_watermark_detection_rate == 0.0
-    assert report.summary.watermark_detection_rate_drop == 1.0
-    assert report.summary.mean_watermark_score_drop == pytest.approx(0.75)
-    assert report.summary.median_watermark_score_drop == pytest.approx(0.75)
-    assert report.summary.mean_control_score_shift == pytest.approx(-0.02)
-    assert report.summary.control_transform_rate == 1.0
     assert report.summary.watermark_transform_rate == 1.0
-    assert all(value.watermark_changed for value in report.results)
-    assert all(value.control_changed for value in report.results)
+    assert report.summary.control_transform_rate == 1.0
+    assert report.summary.mean_watermark_score_drop == pytest.approx(0.75)
 
 
 def test_synthid_smoke_finishes_all_key_blind_transforms_before_detector_scoring() -> None:
@@ -102,7 +126,7 @@ def score(self, text: str) -> float:
                 return 0.30 if transformed else 0.80
             return 0.95 if transformed else 0.20
 
-    report = run_synthid_smoke(_prompts(), Backend(), target_fpr=0.05)
+    report = run_synthid_smoke(_prompts(), Backend(), target_fpr=0.05, transform=_historical_visible_edit)
 
     assert report.summary.threshold == pytest.approx(0.20)
     assert report.summary.pristine_control_detection_rate == 0.0
diff --git a/tests/test_transform_policy_separation.py b/tests/test_transform_policy_separation.py
index 23981482..84ce4050 100644
--- a/tests/test_transform_policy_separation.py
+++ b/tests/test_transform_policy_separation.py
@@ -80,9 +80,10 @@ def test_release_policy_has_no_summary_based_syntax_promotion_path() -> None:
         release_transform_registry((syntax_rule,), ())
 
 
-def test_release_policy_without_promotions_remains_contractions_only() -> None:
+def test_release_policy_without_promotions_is_an_empty_product_registry() -> None:
     registry = release_transform_registry()
     enumeration = registry.enumerate(
         "Do not wait. For example, retry once. The build passed; however, the deploy failed."
     )
-    assert tuple(candidate.rule_id for candidate in enumeration.candidates) == ("contract-do-not",)
+    assert registry.rules == ()
+    assert enumeration.candidates == ()
diff --git a/tools/cycle8_carrier_screen.py b/tools/cycle8_carrier_screen.py
new file mode 100644
index 00000000..28dc7b29
--- /dev/null
+++ b/tools/cycle8_carrier_screen.py
@@ -0,0 +1,90 @@
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+from fuckmark.config import canonical_json_text
+from fuckmark.cycle8.tokenizer_screen import GPT2_FIXTURE, require_gpt2_encoder, screen_carrier_tokenizer
+from fuckmark.cycle8.unicode_meta import audit_codepoints, iter_default_ignorable_codepoints_v1
+from fuckmark.hashing import sha256_json
+from fuckmark.product.rendering import compare_chrome_pre_screenshots
+from fuckmark.product.visible_projection import is_carrier_insertion_v1
+
+
+FOCUS_CODEPOINTS = (
+    0x200C,
+    0x200B,
+    0x200D,
+    0x2060,
+    0xFEFF,
+    0x034F,
+    0xFE00,
+    0xFE0E,
+    0xFE0F,
+    0x180B,
+    0x17B4,
+    0x115F,
+    0x00AD,
+    0x00A0,
+)
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--render", action="store_true")
+    args = parser.parse_args(argv)
+    rows = audit_codepoints(iter_default_ignorable_codepoints_v1())
+    focus = audit_codepoints(FOCUS_CODEPOINTS)
+    encoder = require_gpt2_encoder()
+    tokenizer_rows = [screen_carrier_tokenizer(codepoint, encoder=encoder) for codepoint in FOCUS_CODEPOINTS]
+    rendering = []
+    fixture = GPT2_FIXTURE
+    if args.render:
+        for codepoint in (0x200C, 0x034F, 0xFE00, 0x17B4, 0x115F):
+            carrier = chr(codepoint)
+            transformed = "".join(
+                character + carrier if character.isascii() and character.isalpha() else character for character in fixture
+            )
+            comparison = compare_chrome_pre_screenshots(fixture, transformed)
+            rendering.append(
+                {
+                    "codepoint": codepoint,
+                    "label": f"U+{codepoint:04X}",
+                    "visible_ok": is_carrier_insertion_v1(fixture, transformed, (codepoint,)),
+                    "environment": comparison.environment,
+                    "status": comparison.status,
+                    "equal": comparison.equal,
+                    "detail": comparison.detail,
+                }
+            )
+    classification_counts: dict[str, int] = {}
+    for row in rows:
+        key = str(row["classification"])
+        classification_counts[key] = classification_counts.get(key, 0) + 1
+    durable = [row for row in rows if row["classification"] == "DURABLE_TRACK_CANDIDATE"]
+    summary = {
+        "scan_version": "cycle8-carrier-screen-v1",
+        "default_ignorable_count": len(rows),
+        "classification_counts": classification_counts,
+        "durable_track_count": len(durable),
+        "durable_track_labels": [row["label"] for row in durable],
+        "focus": focus,
+        "tokenizer": tokenizer_rows,
+        "rendering": rendering,
+        "gpt2_encoder": "unavailable" if encoder is None else "gpt2",
+        "chromium_render": "requested" if args.render else "UNKNOWN",
+    }
+    payload = {key: value for key, value in summary.items()}
+    summary["summary_hash"] = sha256_json(payload)
+    destination = Path("specs/cycle8/carrier-screen-v1.summary.json")
+    destination.parent.mkdir(parents=True, exist_ok=True)
+    destination.write_text(canonical_json_text(summary) + "\n", encoding="utf-8")
+    print(destination)
+    print("default_ignorable_count", len(rows))
+    print("durable_track_count", len(durable))
+    print("gpt2_encoder", summary["gpt2_encoder"])
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tools/cycle8_fixture_compare.py b/tools/cycle8_fixture_compare.py
new file mode 100644
index 00000000..635d983d
--- /dev/null
+++ b/tools/cycle8_fixture_compare.py
@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+from fuckmark.config import canonical_json_text
+from fuckmark.cycle8.compare import arm_registry, cycle8_fixture_samples, run_fixture_compare
+from fuckmark.cycle8.decision import classify_fixture_compare
+from fuckmark.cycle8.registry import apply_all_candidates
+from fuckmark.cycle8.tokenizer_screen import GPT2_FIXTURE, require_gpt2_encoder
+from fuckmark.durable_io import write_canonical_json_fsynced
+from fuckmark.hashing import sha256_json
+from fuckmark.product.rendering import compare_chrome_pre_screenshots
+from fuckmark.product.visible_projection import is_carrier_insertion_v1
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--render", action="store_true")
+    args = parser.parse_args(argv)
+    encoder = require_gpt2_encoder()
+    fixture = run_fixture_compare(encoder=encoder)
+    destination = Path("specs/cycle8/fixture-compare-v1.json")
+    write_canonical_json_fsynced(destination, fixture)
+    decision = classify_fixture_compare(fixture)
+    write_canonical_json_fsynced(Path("specs/cycle8/fixture-decision-v1.json"), decision)
+    rendering = []
+    if args.render:
+        for sample_id, text in cycle8_fixture_samples():
+            if sample_id != "gpt2-screen":
+                continue
+            for arm_id, codepoint in (
+                ("u034f-space-x1", 0x034F),
+                ("u034f-space-x8", 0x034F),
+                ("u200c-space-x1", 0x200C),
+                ("ufe00-space-x1", 0xFE00),
+            ):
+                registry = arm_registry(arm_id)
+                transformed = apply_all_candidates(registry, text)
+                comparison = compare_chrome_pre_screenshots(text, transformed)
+                rendering.append(
+                    {
+                        "sample_id": sample_id,
+                        "arm_id": arm_id,
+                        "visible_ok": is_carrier_insertion_v1(text, transformed, (codepoint,)),
+                        "environment": comparison.environment,
+                        "status": comparison.status,
+                        "equal": comparison.equal,
+                        "detail": comparison.detail,
+                    }
+                )
+        render_payload = {
+            "algorithm_version": "cycle8-chrome-render-v1",
+            "fixture": GPT2_FIXTURE,
+            "rows": rendering,
+        }
+        render_payload["artifact_hash"] = sha256_json(
+            {key: value for key, value in render_payload.items() if key != "artifact_hash"}
+        )
+        write_canonical_json_fsynced(Path("specs/cycle8/chrome-render-v1.json"), render_payload)
+        print("chrome_render", canonical_json_text({"rows": rendering}))
+    print(destination)
+    print("visible_pass_rate", fixture["visible_pass_rate"])
+    print("decision", decision["decision"], decision["product_gate"])
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tools/verify_release_install.py b/tools/verify_release_install.py
index d21b4113..971110be 100644
--- a/tools/verify_release_install.py
+++ b/tools/verify_release_install.py
@@ -11,7 +11,7 @@
 
 
 EXPECTED_INPUT = "I do not agree and I cannot stay.\n"
-EXPECTED_OUTPUT = "I don't agree and I can't stay.\n"
+EXPECTED_OUTPUT = "I do not agree and I cannot stay.\n"
 PROJECT_ROOT = Path(__file__).resolve().parents[1]
 PROJECT_VERSION = tomllib.loads((PROJECT_ROOT / "pyproject.toml").read_text(encoding="utf-8"))["project"]["version"]
 
@@ -60,7 +60,7 @@ def _verify_artifact(artifact: Path) -> None:
             if not command.is_file():
                 raise RuntimeError(f"missing installed console command: {command.name}")
             version = _run([str(command), "--version"], capture_output=True).stdout
-            if f"FuckMark {PROJECT_VERSION}" not in version or "release-cli-v3" not in version:
+            if f"FuckMark {PROJECT_VERSION}" not in version or "release-cli-v4" not in version:
                 raise RuntimeError(f"unexpected version output from {command.name}: {version!r}")
             transformed = _run(
                 [str(command), "--stdin"],