{
  "step": "C461",
  "status": "completed",
  "title": "Fixed Mirror Images of the Complete 529 Pair Inventory",
  "previous_certificate_sha256": "8eca05296992e22a17cff240c39f5d48cf47922311fa181fe107a2384cc5fa48",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C461_Fixed_Mirror_Images_of_All_529_Source_Pairs_20260925.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C461_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": "e32790a4a68a008966bf7726ba3c39797264d49f88348e1aba684767f8056faf",
  "source_manifest_sha256": "84ff68ef40c0c6190b8cca8b2b0e50654fe0d5931edce2c4ba6798f19a7effc7",
  "report_sha256": "ddb4d03c8644b6ae05ece22ceac02504e16989648b7ce4213be91b2855cb3d0f",
  "checkpoint_sha256": "dde6bba464c15b9500a2bab9f5756090a1789d082860d357373c178353118454",
  "data_sha256": "68ecc909105dc23bd743f92f2d89b8181b8c1a822d344553fee2e710d5455f11",
  "results_sha256": "a14612517ee4b43f4ac038576896d836e20a3569d44aaee17ee1bd51272a7cdc",
  "calculation_sha256": "d9abe112aa422373e818568a2a997242474731509fecf0d605d7bb66cd849a14",
  "verifier_sha256": "46964ade0128d97b589fb678853daf7b81ffff1d90eb1a99221031ba734b093f",
  "next_step_decision_sha256": "9b40ce28b47fdd6a0cd9e59d5490a4e5613a7d966f883d144e4441c22d3a9af7",
  "replay_sha256": "0c917c8acdbaff05e4502b5fd67b4bb7bae9d86422b02e4e867d18e32235e00b",
  "control_integrity_sha256": "24e687bf3e03c7f16c3ca2aafe4c72e9aab25f03d55fa644c44a178e698ff3df",
  "readme_sha256": "cd997339e2def1de9f772e99abd965b967da9476398a82e6ce767aec9c947bad",
  "assertions_passed": 120,
  "source_checks_passed": 22,
  "main_result": "The120 fixed-Mirror pair trials yield five complete images, all2K intervals: four atA−2639 and one atA−2635. Exactly two have17K cross-spans, reproducing2648/3706↔−6345/−5287 and2650/3708↔−6343/−5285. The other three have8991,8995 and8997 cross-spans.",
  "limits": "The two fixed exchanges are the complete active Mirror menu in this test. This does not claim that only two17K rows existed in earlier work; C287 is checked next without fitting replacement constants.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_step_executed": false,
  "next_proposed_step": "Compare the five fixed-exchange images with the complete archived C287 annual-row assignments, derive the condition for17K cross-spans, and distinguish inherited phase matches from coordinate-only images."
}