{
  "step": "C275",
  "date": "2026-09-24",
  "status": "completed",
  "title": "Provenance of the529 placement premises",
  "previous_certificate_sha256": "23ab41af374a05812d024b1be7ef9b141086b11bbf9ca456b2255efd8b5968f6",
  "source_manifest_sha256": "57d6390be228d375390923bcc4a00929ac3250626ee3c960c04417176939c647",
  "scope_sha256": "9499cbb66093201719d77c9410f75d8d03f2d25507103b66a483900c4ac50c0b",
  "passage_spec_sha256": "c02692f67d73d416b1b662a448bc77d00c43c7c0edffcfce029fbbdd9430b5b1",
  "authored_premise_assessment_sha256": "e41e60c37a7b7c50966daf28e84a60160d2f47b00bb4c03a04b4a7cbbe90ae7f",
  "report_sha256": "25fa28f75ecd9d705a19cb112590317a09e62f0683030282f8e5a904b979993c",
  "checkpoint_sha256": "d53b5252c7105cb789401130a19987af5e9916db844bbf732aff7f5e048b9912",
  "supplemental_note_sha256": "7d55244304b1785a93b5a36d4772650ba1d5f936b3b1353572ab16a6436ff94a",
  "user_supplement_intake_sha256": "d8d10afd0ebcdfa71a7d2449c64eed20cd30249ea8f358f8e727c8bfd9457986",
  "results_sha256": "5242f111d73566dd46d73a4afa9fe435307be1f609b824b7a84f5e3acac639ba",
  "verifier_sha256": "ccf66a961174d9efbe941a12737a549f844382393ac908a6e0123195f722fffb",
  "review_sha256": "fc245e91050a6c7bc3bef788ff6b6bf1a0149eaef2cf8687ff86ef6fa6018b92",
  "replay_sha256": "6add21458bab3ef3942c04551fdd8f0ba664540914135eb6eb953b8b1fc2e350",
  "control_integrity_sha256": "2545aa284aa63b3977fd386277ccff95298a2b9f98996e64e1545e39b74d93fb",
  "assertions_passed": 72,
  "replayed_output_files": 5,
  "frozen_existing_inputs": 13,
  "premises_audited": 3,
  "audit_passages": 19,
  "supplemental_passages": 5,
  "main_result": "All three placement premises are explicitly documented. Shared5290 and SP4715 are supplied placements; the join and interval reflection are their consequences and can recover them conditionally. Under the common MT/LXX shift, the MT join is equivalent to placing the LXX opening at the fixed global origin. The3K+7K source chain subdivides an already retained span to the6BC target.",
  "classification_status": "authored documentary assessment; exact source excerpts and arithmetic verified separately",
  "independent_historical_necessity_established": false,
  "supplement_used_to_redirect_research": false,
  "supplemental_correction": "LXX5494/4534 +8464 -> AD2970/3930; reflected-anchor gaps1564/2484 ->1700/2700. Offsets1380/880; difference920->1000. AD3746/2300 superseded for this observation.",
  "controls_modified": false,
  "graph_modified": false,
  "new_source_event_identities_asserted": false,
  "historical_campaigns_rerun": 0,
  "new_parameter_fit": false,
  "new_independent_review": false,
  "review_type": "author provenance and arithmetic consistency review",
  "scientific_limits": [
    "The inspected documentary support does not prove necessity from chronology coordinates alone or absence of support elsewhere.",
    "Presentation order in a document is not actual discovery chronology.",
    "A source radius, selected translation, named source subdivision and equality of transformed images are distinct roles.",
    "S11 was read through the retained suffix(1) copy; byte equality with the axis bibliography suffix(2) is not asserted.",
    "The assigned598 increment remains fixed and unaudited as an operator requirement.",
    "Supplemental comparisons preserve full seasonal pairs and compare reflected AD anchors; no upstream Gear states are introduced."
  ],
  "regular_Gear_scope": [
    "Noah",
    "Shem",
    "Flood"
  ],
  "next_proposed_step": "C276: source-to-operator audit of the retained598/600 rectangle and assigned598 translation increment",
  "next_step_executed": false
}