bug(unic-archon-dlc): three /qa nodes emit prose that nothing reads and nothing keeps #458

What happened

Three nodes in /qa emit prose as structured output that nothing reads and nothing writes to disk. The content exists in Archon's SQLite event row and nowhere else. When /cleanup prunes the worktree, it is gone.

The only $e2e|$coverage-gate|$uat-prep.output.* reference in the whole file is line 337, which reads .result on the first two. summary and criteria have no reader at all.

uat-prep's own prompt states the purpose the emission fails to serve, at :181:

Emit the numbered criteria as structured output so the finding-capture step can reference them

The finding-capture step is uat-gate.on_reject. It references $REJECTION_REASON and nothing else.

Why it matters

uat-gate is the one place in /qa where a human judges the run. Its approval message, :216, tells that human:

review the UAT checklist printed by uat-prep above against the e2e and coverage-gate results

"Above" is console scrollback. So the evidence at the only human gate in this Box is terminal output, and /qa has no report node, so nothing it produces survives the worktree. A reviewer on the pull request sees none of it.

How this was found, and what it is not

It came out of #438's grilling. That ticket claimed /build's implement-review-precheck recorded its findings nowhere. That claim is false — unic-dlc-build.yaml:578 has the report node fold $implement-review-precheck.output.findings in verbatim, and run 2's thirteen findings are committed in workflows/profile-card/report.md § 4 on origin/feature/43004_build-profile-card in DXP-DesignSystem (commit c66eac9).

Surveying the other three Boxes for the same shape is what found these three fields. /build routes its prose correctly. /qa does not.

One observation seeded #438's false conclusion, and it applies here too. "The run's artifacts directory was empty" was true of $ARTIFACTS_DIR, which resolves outside the repo under ~/.archon/workspaces/<name>/artifacts/, is always gitignored, and is reused on resume. The repo-relative Session dir, <artifacts_dir>/<slug>/, is a different place and is deliberately committed. Name the home in every criterion that names a path. A criterion saying "the node writes its summary to the artifacts directory" is satisfiable in a way that fixes nothing.

The pattern that already works here

unic-dlc-pr-review.yaml solves the same problem without a DAG edge: prep writes SESSION/prep.json, and reconcile reads it back at :395. That is why prep's has_source / has_tests / has_types / has_docs / touches_error_handling / prior_findings fields look orphaned to a grep for $prep.output.* and are not. Write the file, read the file.

The open question, to be grilled before criteria

Does /qa gain a durable artefact of its own, or does each node write its own file into <artifacts_dir>/<slug>/?

Neither is decided. The first mirrors /build's report node and gives the human at uat-gate one thing to open; the second is smaller and matches what pr-review already does. A prior question sits under both, the same one #438 turned on: who is the reader, and when do they read? The human at uat-gate during the run, and the reviewer on the pull request afterwards, pull in different directions.

Overlap to state in whatever criteria this gets

#430's criterion 10 was amended on 2026-09-03 to require its unresolved-needs block to be durable, in a file under <artifacts_dir>/<slug>/. In /qa that block attaches to exactly the two summaries above. So #430 and this ticket touch the same file and the same nodes, and #430 is the one dispatched. Whichever lands first, the other rebases. If #430 lands first it will have created a file-writing surface in /qa that this ticket then generalises, which is the cheaper order.

Out of scope for run 3

Ruled by the maintainer on 2026-09-03: /qa is not needed for run 3 or for the #456 map. This ticket carries the /qa half so #438 can keep only its /build half.