Extend verify_task_body.py figure-text opaque-code token grammar with the single-letter-prefix arm-slug class
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Goal
verify_task_body.py's "figure text opaque config codes" check scans rendered figure text for opaque slug tokens, but its token grammar missed the arm-slug class a_rb_ctx / b_rb_ans / c_map_ctx / c_map_pfx / d_transport (single-letter prefix + underscore-joined stems) while catching mistake_gsm8k in the SAME body's figure set. Demonstrated on task #2221 round 1: the check WARNed only on trait_mix_size_vs_acquisition.png (mistake_gsm8k) while checkpoint_detection_auc.png rendered raw arm slugs a_rb_ctx/c_map_ctx/c_map_pfx in its legend and passed silently — the clean-result-critic's Lens 3 grammar caught what the mechanical check did not (clean-result-critique v1 on #2221, 2026-08-12).
Fix: extend the check's token classes with the single-letter-prefix underscore arm-slug shape (e.g. ^[a-z]_[a-z0-9]+(_[a-z0-9]+)+$ alongside the existing classes), with a test reproducing the #2221 legend miss. Keep false-positive guard: common English single-letter contractions do not match this shape; run the check against a sample of recent v4 bodies to confirm no new spurious WARNs.
Provenance
Surfaced as a workflow-fix prose follow-up by the clean-result-critic on #2221 (round 1, 2026-08-12); routed by the #2221 orchestrator per .claude/rules/workflow-fix-on-bug.md (prose follow-ups auto-file + spawn). Target file: scripts/verify_task_body.py (figure-text opaque-code check). Candidate fingerprint: figure-text-opaque-codes/arm-slug-single-letter-prefix-class.