workflow-fix: verify H1 == frontmatter title (set-title never syncs the body H1)

Overview / Motivation

Auto-filed from a formal workflow-fix candidate raised by the clean-result-critic (round 2, fold base-separator-control) on task #825. Confidence: HIGH.

Goal

Add a verify_task_body.py check (sentinelled bodies only) FAILing when the whitespace-normalized H1 text differs from the frontmatter title.

Workflow gap

• Bug observed: On #825 the analyzer retitled via task.py set-title (frontmatter + REGISTRY updated) but never synced the body H1, so the dashboard list title and the body H1 diverged for a full critic round with no mechanical catch — the verifier's title check only validates the confidence tag on the H1.
• Why it is a workflow gap: the title lives in two places (frontmatter via set-title, H1 via set-body) with no check asserting they agree, so every retitle-without-H1-edit silently ships a stale headline; all 6 recent awaiting_promotion bodies satisfy equality, confirming it is the intended invariant.
• Confidence (emitter): high

Proposed change (candidate diff sketch — refine in planning)

+ def check_h1_matches_frontmatter_title(body, fm):
+     h1 = next((l[2:].strip() for l in body.splitlines() if l.startswith("# ")), "")
+     ft = " ".join(str(fm.get("title", "")).split())
+     if " ".join(h1.split()) != ft:
+         return FAIL("H1 title differs from frontmatter title — sync via set-title + set-body")
+     return PASS

Consider also: a set-title flag (or default) that rewrites the body H1 in the same flock+commit.

Scope / surfaces

• Primary target: scripts/verify_task_body.py (+ optional scripts/task.py set-title H1 sync)
• Regression test in tests/test_verify_task_body.py.

Provenance

• workflow_fix_target: scripts/verify_task_body.py
• fingerprint: 507a7468937c

(Verbatim candidate block preserved in the emitting critic's epm:clean-result-critique v12 marker on task #825.)