diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f401cffe2..4fef06eec 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -548,6 +548,28 @@ jobs:
         # lease, no torch, no numpy, no checkpoint.
         run: |
           python3 tests/scripts/test_ltx2_latent_dump.py
+      - name: The committed LTX-2 oracle goldens still hash to what records them (#2553)
+        # Registered in TWO places, like the suites above: here and in
+        # `scripts/agent-preflight.sh`. It was in ONE of them. `SUITES` held it
+        # from the start and this file never did, so the digests that anchor the
+        # oracle evidence gated on a developer box and were green on the forge.
+        #
+        # #2520 made that expensive. The suite now also covers
+        # `tests/parity/goldens/ltx2_oracle_latent/` -- the Phase A latents a
+        # future cross-decode reads INSTEAD of taking a GPU lease, 68 KB whose
+        # whole value is that they are the bytes the leased run produced. Without
+        # this step a pull request could overwrite `video_latent_bfloat16.raw`,
+        # or rewrite `SHA256SUMS` to match a corrupted one, and merge green.
+        #
+        # Nothing here can skip: standard library only -- `hashlib`, `json`,
+        # `re`, `pathlib` -- over four committed files, no numpy, no build, no
+        # GPU, no lease, no checkpoint, no network, 0.02 s. The step needs no
+        # guard, and a guard is what would turn this absence into false coverage.
+        # The registration itself is pinned in `REQUIRED_SUITE_REGISTRATIONS`,
+        # so deleting this step reds `check-test-registration.py` rather than
+        # restoring the gap.
+        run: |
+          python3 tests/scripts/test_ltx2_oracle_goldens.py
       - name: Every LTX-2.5 A/B arm sets a knob value the dispatch parses (#1751)
         # The `VLLM_LTX2_DIT_FLASH_ATTN` values a harness exports and the values
         # `ltx2_device.cpp` matches are two literals in two languages, and nothing
diff --git a/scripts/check-test-registration.py b/scripts/check-test-registration.py
index 729707ac6..6fc563111 100644
--- a/scripts/check-test-registration.py
+++ b/scripts/check-test-registration.py
@@ -79,6 +79,17 @@ class the labelled gate itself exists to close.  ``REQUIRED_LABEL_SELECTIONS``
 # the M9-M12 mutation cases match on.
 REQUIRED_SUITE_REGISTRATIONS = {
     "test_sglang_lease_identity": "tests/scripts/test_sglang_lease_identity.py",
+    # #2553. Added the moment the suite reached both lanes, which is the only
+    # moment it costs nothing: it was preflight-only, so the CI step landing
+    # beside this line would otherwise have been deletable at rc=0 -- the exact
+    # #1833 finding this set exists to answer. It recomputes the sha256 of the
+    # #1864 reference render and the #2514 Phase A latents, the evidence
+    # `.agents/oracles/ltx-2.md` cites for `gateable = yes`.
+    #
+    # This is the widening the seeding comment above anticipates, one classified
+    # suite at a time. It is NOT the symmetric population rule, which still
+    # belongs to #408 and #1509.
+    "test_ltx2_oracle_goldens": "tests/scripts/test_ltx2_oracle_goldens.py",
 }
 
 def _without_line_comments(text: str) -> str:
diff --git a/tests/scripts/test_check_test_registration.py b/tests/scripts/test_check_test_registration.py
index 30128e56b..36d7587f0 100644
--- a/tests/scripts/test_check_test_registration.py
+++ b/tests/scripts/test_check_test_registration.py
@@ -50,6 +50,9 @@
       - name: The SGLang lease identity gate detects a tree that is not the pin
         run: |
           python3 tests/scripts/test_sglang_lease_identity.py
+      - name: The committed LTX-2 oracle goldens still hash to what records them
+        run: |
+          python3 tests/scripts/test_ltx2_oracle_goldens.py
 """
 
 PASSING_PREFLIGHT = """CHECKERS=(
@@ -58,6 +61,7 @@
 SUITES=(
   test_check_test_registration
   test_sglang_lease_identity
+  test_ltx2_oracle_goldens
 )
 for checker in "${CHECKERS[@]}"; do
   python3 "scripts/$checker.py"
@@ -331,6 +335,42 @@ def test_M57_deleting_the_pinned_ci_suite_fails(self) -> None:
             "test_sglang_lease_identity is missing from the CI suite lane",
         )
 
+    # The SECOND pinned suite (#2553).  These two cases are what makes widening
+    # `REQUIRED_SUITE_REGISTRATIONS` a semantic change rather than a fixture
+    # edit.  Adding the suite to `PASSING_CI` and `PASSING_PREFLIGHT` alone is
+    # symmetric and additive, so the base checker -- which pins only
+    # `test_sglang_lease_identity` -- stays green on it and the widening carries
+    # no evidence at all; `check-pr-size.py` rejected exactly that, because a
+    # test whose only job is to KEEP an existing case green cannot fail for the
+    # intended reason.  Deleting one lane's registration must name THIS suite.
+    #
+    # They assert the checker's output on a mutated input, never
+    # `"test_ltx2_oracle_goldens" in mod.REQUIRED_SUITE_REGISTRATIONS`, which
+    # would be a tautology over the constant it is supposed to hold.  And they
+    # are deliberately not named `test_M*`: `mutation_suite_integrity_errors`
+    # requires the `test_M*` set to equal the digest-pinned manifest exactly, so
+    # an M-number here would drag `check_test_registration_mutations.txt` and
+    # `MUTATION_MANIFEST_SHA256` into a change that is not about the manifest.
+    def test_pinned_ltx2_goldens_suite_absent_from_ci_is_named(self) -> None:
+        mutated = self.ci.replace(
+            "          python3 tests/scripts/test_ltx2_oracle_goldens.py\n", ""
+        )
+        self.assertNotEqual(mutated, self.ci)
+        self.assert_wiring_error(
+            self.preflight,
+            mutated,
+            "test_ltx2_oracle_goldens is missing from the CI suite lane",
+        )
+
+    def test_pinned_ltx2_goldens_suite_absent_from_preflight_is_named(self) -> None:
+        mutated = self.preflight.replace("  test_ltx2_oracle_goldens\n", "")
+        self.assertNotEqual(mutated, self.preflight)
+        self.assert_wiring_error(
+            mutated,
+            self.ci,
+            "test_ltx2_oracle_goldens is missing from preflight SUITES",
+        )
+
     def test_M18_ci_commands_behind_false_shell_branch_fail(self) -> None:
         mutated = self.ci.replace(
             "          python3 scripts/check-test-registration.py\n"