{
  "step": "C293",
  "date": "2026-09-24",
  "status": "completed",
  "title": "The13K arrangement and fixed8K reflection",
  "previous_certificate_sha256": "04ca4d3fa29284a7496c1db1520ab129e5473e0ebc3755707cdc2004ae4cc9a1",
  "source_manifest_sha256": "1a44b805bd910c1c2f3408cce8c3bf0f92306574e6c837233a5968697e336e6c",
  "step_sha256": "3cb6bfb2696577450d3b68aec1e0ea74220722d2c461e416af96cba0f03ab930",
  "report_sha256": "a131c61b024a14f5036c2e266e3e15b1e5a0a46f4701727902b8821324e0f556",
  "checkpoint_sha256": "12a9924bbccac2262d42db8105f723301400a0f65e5e018dc7982d3c49291e78",
  "results_sha256": "738f063e8e4a2c15ecd0693d56451a0944c6682777f282ba744a9e560cce0c11",
  "data_sha256": "d469c6c4263a858eddd7a9c738136589ef802a611ce318839cf07148cb25fa2b",
  "calculation_sha256": "ed6e8784de75f093a16a08c1619a13c7363ee872d7bbf2eb9120708b24d9e333",
  "verifier_sha256": "1b0d77f7bd90c94c014bf13467830ac053579a4ca021d6d777d8442441f73259",
  "review_sha256": "900b41fd86007fbf93b33d7767f5055d2901e10eb227887c93b6103b816c04e0",
  "replay_sha256": "8ca0b8f8e5673d76656654b00669c06b2032235c439e8a6205b8de230266bb1a",
  "control_integrity_sha256": "41aee61f77fbc03abaf36ac516ed70de5eb5b9e3532ea9adcb9d26b0eeb3b797",
  "next_step_decision_sha256": "d2263ad007b48c2bd8b96c0b2e6b2a25ba7289863d510bdcc12d78aec61cf1f4",
  "assertions_passed": 26,
  "source_checks_passed": 8,
  "frozen_inputs": 6,
  "main_result": "The common-offset13K arrangement has midpoint4K+i; no complete row closes under fixed8K reflection. Only the opening inner comparison1587/2645 is exact.",
  "limits": [
    "The first inner member is a generated source image, not a historical event at1587.",
    "No row-dependent comparison axis is adopted.",
    "The negative result is restricted to common-offset rows."
  ],
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_proposed_step": "C294: release the common annual offset, retaining the fixed13K bridge and8K reflection, and test the full two cumulative fields against the existing regular register.",
  "next_step_executed": false
}