verify_task_body check 31: class-C per-unit-companion candidate set misses prose-named committed figures
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target_file: scripts/verify_task_body.py candidate-fingerprint: check31-classc-stem-matching-misses-prose-named-figures
Goal
Fix verify_task_body.py check 31's class-C candidate set: it matches committed per-unit companion figures by FILE STEM only, so a committed figure the plan names by PROSE ("distinct-3gram vs judge-score scatter") rather than by stem is invisible to the check, and an orphaned-aggregate body ships with a WARN-silent gap.
Evidence
Task #2477 clean-result round 1 (2026-08-23): figures/issue_2477/distinct3gram_vs_score.png was committed at both body-pinned SHAs (3f07e928c1, c492f4493244) and never embedded or mentioned in the body; check 31 stayed silent because the plan names the figure in prose, not by stem. The gap was caught only by the Codex clean-result twin + reconciler (binding REVISE, blocker r5-rank-correlation-per-unit-orphan; see #2477 events.jsonl epm:review-reconcile v1). The Claude clean-result-critic's round-1 verdict proposed the fix shape: extend the candidate set to ALL committed figures/issue_<N>/*.png at body-cited SHAs that the body never mentions (WARN class (a) without the per-unit-stem precondition).
Acceptance
- A committed-but-unmentioned
figures/issue_<N>/*.pngat a body-cited SHA draws a WARN regardless of stem shape. - Existing WARN/FAIL semantics unchanged elsewhere; add a regression test reproducing the #2477 shape (committed scatter, prose-only plan mention, body silent).