{
  "step": "C267",
  "date": "2026-09-24",
  "status": "completed",
  "title": "The2500 midpoint and5750/6250 seasonal bracket",
  "previous_certificate_sha256": "a5a1da16cdad0fe6f67441b07be92eb1b28f67c8a6793f7a09f1dd99716bb50f",
  "source_manifest_sha256": "f30f108850df886c20d9d31450d7be6b4916e095ff5ef68c8e72a374f135f73d",
  "report_sha256": "07d7eb37f73ed352637fa31148a4636945bc30ff1914ad679651697ad8579521",
  "checkpoint_sha256": "6ba939dde25f5f7ba62145c47d8c1130255af4c03e8913e4746d01e509ab2035",
  "results_sha256": "69db3000bc16f79c88dff2b326738aa273338bbaf0eb6f166be38aa1bc01fe33",
  "replay_sha256": "34ff32bcc8fa0427d6f2c582818b572dbfd99e4cd5b6f8fbb0e31aa3ab7c1c9e",
  "control_integrity_sha256": "d993ea007088c36f3c06734831bd7fca55f513867d9364d3362942c3e9f90506",
  "assertions_passed": 138,
  "replayed_output_files": 6,
  "regular_Gear_scope": [
    "Noah",
    "Shem",
    "Flood"
  ],
  "controls_modified": false,
  "graph_modified": false,
  "new_source_event_identities_asserted": false,
  "main_result": "2500 is a generated LXX whole-field midpoint radius;5750 and6250 are inner and outer LXX seasonal radii in ratio25/23;7500 is a whole seasonal-envelope length",
  "scientific_limits": [
    "FixedC266 chart and six-field core",
    "Ratio match does not preserve complete phase pair or quarter-year lattice",
    "No bilateral source-point realization of7500 within core",
    "No historical event identity inferred from chart labels"
  ],
  "next_proposed_step": "C268",
  "next_step_executed": false
}