{
  "step": "C469",
  "status": "completed",
  "title": "Sourced 2K Interval Ladders, Finite Closure and Mirror Boundaries",
  "previous_certificate_sha256": "fc82980de2e98d35a7636ba07352f3777833e69beefe4208d721c44235ed830f",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C469_Sourced_2K_Interval_Ladders_and_Mirror_Boundaries_Synthesis_20260925.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C469_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": "26caa1563dd51d4bff3339598b7b3044daec4a520593c3183f72eab9e7d747fa",
  "source_manifest_sha256": "ac59f2eb369d8d1347c042f68e171500889b8b883662be0de8748735e210733f",
  "report_sha256": "46510731ac1818d061279f145fb5ec367be3c1afd72711d816a706f08ea7f33c",
  "checkpoint_sha256": "e117985038a4bdb5658e57a30b43d0030b6573d1282a81997f33b0b8c6a31263",
  "data_sha256": "e97e516521738733dc10bd61af458bf00d9e443aadc3a408ccfb80848fe42aeb",
  "results_sha256": "6c788ba36abe2cf513d2526a85e646baa8970f4448fcd7f899a2cc796db74817",
  "calculation_sha256": "8d0f7bb12036556c76c92e43fda362364635eac196f1c6d2c50a600bbc53fe60",
  "verifier_sha256": "46964ade0128d97b589fb678853daf7b81ffff1d90eb1a99221031ba734b093f",
  "next_step_decision_sha256": "806f6fc427f08a3a6bd722f7a1505533adfb5bc2140d51eb088d091fefcd65ce",
  "replay_sha256": "c3fd16fbf2f7f2ad1cf084a1d42385cf1788a014f41d0fda032b87f6e3220eeb",
  "control_integrity_sha256": "24e687bf3e03c7f16c3ca2aafe4c72e9aab25f03d55fa644c44a178e698ff3df",
  "readme_sha256": "59452566c617571ea1e3c3583acb8e791a3535729501b813aeef86381f083997",
  "assertions_passed": 99,
  "source_checks_passed": 121,
  "main_result": "C445–C469 are complete. The strongest positive result is the fully sourced common-word interval ladder1058→1150→1250, with endpoint pairs2148/3206→2020/3170→1956/3206 and pivots3620 then2756. A second2K seed shares the first expansion and belongs to the same253→275 translated configuration. The finite mixed graph has no529 endpoint connection; fixed Mirror/phase and source-anchor limits are explicit. C470 remains unexecuted.",
  "limits": "All exhaustiveness and absence claims refer to the declared finite registers and fixed operator menus. C470 is proposed only and requires a new instruction.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_step_executed": false,
  "next_proposed_step": "Census all existing 1150-year source pairs, test common E transport to 1250 at the same eight fixed pivots, and record which have a complete sourced 2K predecessor. Keep the source register, pivots and phases fixed."
}