workflow-fix: pre-existing HF audit-claim test failures on main

Overview / Motivation

Auto-filed by the workflow-fix-on-bug protocol from a workflow-fix candidate raised on task #852 (emitting agent: orchestrator, during the Step 9c test-verdict gate).

Goal

Fix the two pre-existing failing HF audit-claim tests on main (test_denial_and_hf_genuinely_missing_passes, test_hf_http_error_is_unverified_not_fail).

Workflow gap

• Bug observed: tests/test_verify_task_body_audit_claim.py::test_denial_and_hf_genuinely_missing_passes and ::test_hf_http_error_is_unverified_not_fail fail on current main with AssertionError at line 229, independent of any branch (confirmed by a repo-root control run during #852's Step 9c gate, 2026-07-02: 2 failed, 2 passed).
• Why it is a workflow gap: scripts/verify_task_body.py is a workflow-surface verifier and these tests pin its HF audit-claim behavior (genuinely-missing → PASS; HF HTTP error → UNVERIFIED not FAIL); a red invariant test on main poisons every issue branch's Step 9c touched-scope gate (it fired inside #852's gate and had to be triaged as pre-existing).
• Confidence (emitter): medium (root cause not yet diagnosed — either a verify_task_body.py regression or HF Hub API/error-shape drift; both tests assert False at test line 229).

Proposed change (candidate diff sketch — refine in planning)

# Diagnose first: run the two tests with -x --tb=long on main.
# Likely either:
+ scripts/verify_task_body.py: restore the genuinely-missing/HTTP-error classification
+   (UNVERIFIED, never FAIL, on HF HTTP errors; PASS on denial+genuinely-missing), OR
+ tests/test_verify_task_body_audit_claim.py: update the mocked HF error shape to the
+   current huggingface_hub exception contract if the library drifted.

Scope / surfaces

• Primary target: tests/test_verify_task_body_audit_claim.py, scripts/verify_task_body.py
• Grep the workflow surface for the pattern before editing (grep -rn 'audit_claim\|genuinely_missing' scripts/ tests/) 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 — it MUST NOT auto-route any of its own subagents' workflow-fix candidates (recursion guard).

Provenance

• workflow_fix_target: tests/test_verify_task_body_audit_claim.py, scripts/verify_task_body.py
• fingerprint: 19092e467e3c

Surfaced prose (verbatim): during #852's Step 9c gate, 4 subset failures triaged — 2 branch-caused (fixed in fc52c1ed94), 2 PRE-EXISTING on main: tests/test_verify_task_body_audit_claim.py::test_denial_and_hf_genuinely_missing_passes + ::test_hf_http_error_is_unverified_not_fail (AssertionError line 229, control run at repo root on main).