{
  "step": "C466",
  "status": "completed",
  "title": "Seven-Coordinate Source Certificate for the Complete 2K Ladder",
  "previous_certificate_sha256": "a0a1e8c81673cf50e4544d7d38e98e6bc2d3a0a9b8d72c0f418515f7bd7e1d01",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C466_Seven_Coordinate_MT_SP_Witness_Certificate_20260925.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C466_20260925.md",
    "data": "evidence/DATA.json",
    "results": "evidence/RESULTS.json",
    "calculation": "evidence/CALCULATION.py",
    "verifier": "evidence/check.py",
    "next_step_decision": "NEXT_STEP_DECISION.json",
    "replay": "REPLAY.json",
    "control_integrity": "CONTROL_INTEGRITY.json",
    "readme": "README.md"
  },
  "step_sha256": "c5da90a70c196c914a574ee9789734fc85bf2f51d6dab5e2488dc67b7a95af0f",
  "source_manifest_sha256": "d4f47f18eaa6c1d7a0e0cac8f2767fb440b1d8496a66e91d837f11e2ac479ebc",
  "report_sha256": "ce5d1900c315eec1510237315baeb2d8bb6acefab98bf69d2baca10d7aa0c933",
  "checkpoint_sha256": "75eb98077891f00b698202444630979aad58bf2774b3a9faac9e6a1f338cd7e9",
  "data_sha256": "f67aeb1d464aabda135a36ec80cb259762509b15b915855ed6488c1046699593",
  "results_sha256": "f2e6c86c3373ec6085dcd27f19fd0aed046c97c38ec2f1ffcb408b775bf34b95",
  "calculation_sha256": "7e31f0549da9ec1d12610033a1464b34d173a0831f6cd53df5c7a13c47815efb",
  "verifier_sha256": "46964ade0128d97b589fb678853daf7b81ffff1d90eb1a99221031ba734b093f",
  "next_step_decision_sha256": "71f84cfe6e96cd221132fd94f29d2352b778bc0406b0112e2c36f148c1720926",
  "replay_sha256": "14b11bc0e401b0541501d9e1307e38b71ec04e6898974d06676901a1746d8d70",
  "control_integrity_sha256": "24e687bf3e03c7f16c3ca2aafe4c72e9aab25f03d55fa644c44a178e698ff3df",
  "readme_sha256": "e969934fea21b47befdea006797dd04d6f5e120149ef80a93c79340bdd33438c",
  "assertions_passed": 17,
  "source_checks_passed": 21,
  "main_result": "The complete1058→1150→1250 ladder has a seven-coordinate MT/SP provenance certificate. All seven typed source records are regenerated from six controlling source excerpts. Endpoint equations determine the pivots uniquely as3620 and2756; the SP-companion and primary-death qualifications are explicit.",
  "limits": "Minimality refers to this fixed witness and its declared words. It is not a claim that no other construction could exist in a larger, differently scoped source menu.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_step_executed": false,
  "next_proposed_step": "Remove each of the12 fixed operators one at a time, recompute the shared529-pair closure and mixed strong-component structure, and identify the minimal operator support for the positive interval ladder and the two cycles."
}