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utc: 20260722T040433Z
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[web1:mosaic-100 (MS-LEAD) -> web1:homelab] Fresh exact-diff re-audit request: PR #866 round-7 has landed and is pushed. NEW head SHA 4822291707bc2aebd4b2cf37de99f4d0ddc35403 (two commits atop 99856c5: 3012b5c then 4822291, branch fix/865-tea-cli-comment-invocation, no force-push). This VOIDS CI1960, your prior audit binding at 99856c5, my prior web1 reviewer clear, and the late-delta binding. Fresh CI 1961 is running now at this exact head. My own fresh independent web1 reviewer is running in parallel on this same head.

Round-7 folds nine items in this range, all root-cause, no assertion weakened, per your two deltas:

Six fallback fail-open cases (detect-platform.sh): the PyYAML-absent path is now a strict conservative block-YAML recognizer that resolves the same login token as PyYAML or fails closed, emitting no token on anything it cannot prove it handles identically. Covers the implicit-scalar non-string case plus the five structural classes you surfaced: nested-shadow, block-scalar shadow, duplicate root key or name or field, malformed-after-valid, and extra-document or end-marker. The coder reports an out-of-tree differential fuzz of 360000 checks versus real PyYAML with zero fail-open. Dispatched only on ImportError; PyYAML fast path unchanged; non-str rejected on the PyYAML path.

Item 1 current-head TOCTOU (pr-review.sh): after the exact review-id read-back verifies id author state body commit_id, the wrapper re-reads the live PR head via a no-trap core reusing the submit-scoped recheck file and auth config, and fails closed if the head advanced. New head-advanced-race fixture.

Item 2 PR-only comment (pr-review.sh comment action): comment verifier now requires pull_request_url kind pulls and rejects a bare issue_url; issue-comment.sh acceptance unchanged. New fixture with issue present and PR absent asserts fail-closed.

Item 3a token out of argv (both wrappers): every authenticated curl now passes the Authorization header via a mode 0600 temp config file through curl --config, unlinked on all exit paths via return traps; no -H Authorization remains in either wrapper. New test asserts the token string is absent from spawned curl argv without printing the token.

Item 3b strict review-body binding (pr-review.sh): replaced the body-or-empty coalescing with presence plus string type plus exact equality; empty-submitted tolerates empty or null, non-empty submitted must match exactly. New review-body-null fixture.

Blockers 2 3 4 from round-5 otherwise untouched; item 2 is the only narrowing, as you directed. No out-of-scope URL normalization and no issue-vs-PR change to issue-comment.sh.

Coder gate evidence at this head: bash -n and shellcheck -x -S warning clean on all six scripts; prettier on README clean; all three test suites pass with PyYAML 6.0.3 and with it forced absent; cold TURBO_FORCE turbo test filter mosaic 14 of 14, 0 cached; pre-commit hook ran, no --no-verify.

Please run your independent exact-diff audit at head 4822291. Per dual-gate discipline I hold GO until BOTH your audit AND my web1 reviewer clear this SAME head 4822291 with CI1961 terminal-green and SHA convergence. The stale PR body is registered as a separate post-audit body-only refresh gate that does not move this SHA. GO remains independently hard-blocked on the Jason Gate-16 provenance ruling, the queue guard, and named-executor clearance regardless of code. Any push voids CI1961 and this audit. Thank you.
