[finding] tests/trust-trail-base-identity.test.sh — Every executed b.5 row resolves an empty label set, so the l #801

@TheFJK — /uberdev:premerge flagged a blocker finding on PR #793.

Origin: b91a1efddcf3a7d76231e72c66146acb27f308a2
Agent: premerge.review.code_review
File: tests/trust-trail-base-identity.test.sh:523
Severity: blocker (Phase premerge)
Disposition: DEFERRED (premerge-repair-budget-exhausted)
Tier: BLOCKER
Blocks: #793

Findings (1)

1. tests/trust-trail-base-identity.test.sh:523 — blocker / BLOCKER / DEFERRED (premerge-repair-budget-exhausted) — Every executed b.5 row resolves an empty label set, so the label/trailer agreement check, the premerge gate token and th

Lenses: premerge.review.code_review

_fence_row builds PR_JSON as {"baseRefName":...,"baseRefOid":...} with no labels key, so every executed b.5 row resolves LABEL_INSTRUMENTS to the empty string and therefore TRAILER_CONTRACT_REFUSAL=trust_trail_trailer_missing - including the rows named premerge-no-refusal and premerge-instrument-parsed, which assert only the unrelated BASE_IDENTITY_REFUSAL. The runner never prints TRAILER_CONTRACT_REFUSAL, PREMERGE_GATE_ATTEMPT or REVIEW_PR_DEFERRED_CRITICAL, and a grep over tests/ finds no reference to any of the three. Proven by mutation: changing TRAILER_CONTRACT_REFUSAL=trust_trail_trailer_missing to an empty assignment, turning the block's stated default-deny into default-allow, leaves merge.test.sh, trust-trail-base-identity.test.sh and trust-trail-evaluator.test.sh all green. The fix these rows are cited as proving has therefore never been executed against a populated label set.

To resolve: address the findings above in code and close this issue. Closing resolves exactly the findings listed in this body and the findings added by a later comment on it — one index records both, and closing resolves that recorded set and nothing else. A finding in this file that this issue never recorded is filed as a NEW issue rather than suppressed, so closing never mutes the file. Before closing, apply finding:true-positive if it was a real defect or finding:false-positive if it was not — that label is the eval ground truth (RFC 0018).