ci(agents): require exact coded scene regression gate

[adrianwebb]

Outcome

Make cli's 9 exact coded scene checks a required Verify step with retained immutable evidence.

Work authority

• Work item / Issue: Platform #520; Reviewer feat(dev): orchestrate atomic rebuild propagation #62
• Proposal / decision: N/A — user-directed regression gate.
• Assignment / checkpoint: N/A — CI integration.
• Actor: Codex
• Human authority: @adrianwebb
• Agent / capacity provider: N/A
• Exact base ref: staging 84ca95c
• Exact head ref: ci/520-scene-regression-gate 78e22ff

Contributor mode (select one):

• Human-authored
• Agent-assisted under human authority
• Agent-authored under human authority

Plan

Reuse one exact Reviewer Action. Execute package-owned scenes on the real owner tests; missing/skipped evidence blocks verification. No release or second runner.

Changes and commits

78e22ff: thin invocation of Reviewer run-scenes at e29c5bf2db97188c47fdc67a7a098e81a95ced22.

Verification

git diff --check passes. Existing local 9-check scene receipt passes. Reviewer Action's 75 tests, strict TypeScript and Actions 36238802558 pass. This PR's Actions will execute the actual gate and retain its evidence; component success is not golden acceptance.

Risk and rollback

Only verification configuration changes. Remove this invocation to roll back; ordinary tests and scenes remain. Artifacts retain seven days to limit storage. No secrets or live service mutation.

Completion summary

CI integration ready for automated verification. No RC, tag or golden pass claim.

Submission checklist

• The change is bounded to the stated work item and target repository.
• Exact base and head refs are recorded and the branch is ready for review.
• Verification and compatibility evidence are recorded above.
• No plaintext secrets, credentials, machine state, or unrelated residue are included.
• Plan, status, commits, and completion summary form a complete durable record.
• Rollback or recovery steps are documented and executable.