{
  "step": "C337",
  "status": "completed",
  "date": "2026-09-24",
  "title": "Source factorization of the two 2K sides",
  "previous_certificate_sha256": "bd05ec8bc5df0bc6c355c1e14c68b73908a1b8f85ed9618570931927625cc37b",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C337_Source_Factorization_of_Two_2K_Sides_20260924.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C337_20260924.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": "4abc659d193fb4a17bca69835c8d8903cba07e8e047f626e1b54560aa5ed3394",
  "source_manifest_sha256": "4a80193985c09afd4619d9c8e78e3700e1caa29fcf4e468d64259b71df3e299c",
  "report_sha256": "7e05b78366e20feaeac233d70a1a4e0c7c5b8e96fa09a0658e962ac490ebaa35",
  "checkpoint_sha256": "9b135e1d260c9d2e1c03be58486fda12c5c481063cbd053c4aab2b7364a524d9",
  "data_sha256": "bcec50c57ab23accd16e3a1bb1feb699c59ce55256e3509db64efbdf103f696e",
  "results_sha256": "de2cdf1c88fe74f290652dafa29a5bb5d12cc415fe34841d5e9cfec6c53430e1",
  "calculation_sha256": "9aed131fdc340fb94f8f634c8a80f2cedde4ad8c9550abe6c164ce0233964789",
  "verifier_sha256": "9f175670abb70f7819dd7f6d997ff0bef2e58df8dffd763b433f6c6cd62e332d",
  "next_step_decision_sha256": "e937911786a47830fe78c144dc25134cb21b371240c337764857c81868a3659d",
  "replay_sha256": "d075928658aab173a7194f641f75fed61eba9abac832e398e021f13c4e5d642b",
  "control_integrity_sha256": "9810807cb07b02f43f568f68bb82cb41a6eeff6799902254b4932e5c350ac838",
  "readme_sha256": "f0c1313791065f0496ee3a6bd0e4d6635ab87fd8ec4b88d37a667deb6b2481e9",
  "assertions_passed": 427,
  "source_checks_passed": 15,
  "main_result": "Left2K forces cumulativeON-Shem i+2/OFF-Flood i. Right2K forces MT restoredON/Terah60, next Gear, and matching primary/start or companion/close. Six left and four right pairs make24 joins; equal-index17K selects exactly C287 i2…5.",
  "limits": "Necessary and sufficient only within the frozen domains and stated SP/MT contexts. The24 pairings are mathematical controls, not independent observations. No source prescription for selecting the criteria has been established.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "review_provenance": "Root-agent analysis and deterministic replay; no new independent-agent review",
  "next_proposed_step": "Test the duration ladder1058→1150→1250 under E=25/23 against already admitted same-Gear MT Shem and Flood endpoints, with SP Noah held as the existing comparison endpoint. Check primary and companion cases and make no new endpoint or anchor assignment.",
  "next_step_executed": false
}