workflow-fix: check-28 opaque-code classes for bare H<d> + f16/l16 tokens

Overview / Motivation

Auto-filed by the workflow-fix-on-bug protocol from a prose follow-up raised on task #1072 (emitting agent: clean-result-critic).

Goal

Extend verify_task_body.py check-28 _opaque_code_tokens classes to flag bare hypothesis codes (\bH\d\b) and slot-family codes (\bf16\b / \bl16\b) in rendered figure/sidecar text outside path words.

Workflow gap

• Bug observed: check 28 allows bare short-letter hypothesis codes — "(H3)" in #1072's figure-4 panel title and f16/l16 slot-family codes in rendered figure text are not flagged outside path words.
• Why it is a workflow gap: The no-opaque-condition-codes rule is enforced mechanically for slug/@L-pin tokens but not for hypothesis/slot-family codes, so a Lens-3 must-fix had to be caught by the LM critic instead of the verifier.
• Confidence (emitter): medium
• verified-at-filing: grep -n "_opaque_code_tokens" scripts/verify_task_body.py → 2 hits (def at scripts/verify_task_body.py:7319; check 28 block at 7293-7426, label "figure text opaque config codes (slug / @L-pin tokens)") — presence confirmed per-target; current token classes cover slug/@L-pin only (2026-07-18). Live repro: #1072 exploratory_component_profiles.png panel title "(H3)" + "f16 slots" passed check 28.

Proposed change (candidate diff sketch — refine in planning)

in _opaque_code_tokens (scripts/verify_task_body.py:7319):

• add token classes: r"\bH\d\b" (bare hypothesis codes) and
• r"\b[fl]16\b" / slot-family codes, excluding path-like words and
• code-span contexts; keep the existing slug/@L-pin classes.

Scope / surfaces

• Primary target: scripts/verify_task_body.py
• Grep the workflow surface for the pattern before editing and update every hit; list them in the plan.

Constraints / invariants

• Workflow-surface only — never experiment code, configs/, or tasks/.
• scripts/workflow_lint.py --check-asks passes; ruff on touched files passes.
• This session runs under EPM_WORKFLOW_FIX_SESSION=1 and carries a workflow_fix_target: Provenance line — recursion guard applies.

Provenance

• workflow_fix_target: scripts/verify_task_body.py
• fingerprint: 330afec73666

Verbatim surfaced prose: "verify_task_body.py _opaque_code_tokens (check 28) allows bare short-letter hypothesis codes — \bH\d\b ("(H3)" in #1072's fig-4 panel title) and slot-family codes (\bf16\b/\bl16\b) in sidecar rendered text are not flagged outside path words; extending the token classes would mechanize the Lens 3 must-fix above."