{
  "step": "C464",
  "status": "completed",
  "title": "SP-Companion Dependence of the Positive Witnesses",
  "previous_certificate_sha256": "e0de852ff561faab26d22e4132e5e585b88e2ed354ac65f36167c4804361da80",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C464_Essential_SP_Companion_Anchors_and_Source_Sensitivity_20260925.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C464_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": "78fe83e18f6a87b221266039b14c2953139a0b635dab2d32ec05bf7f396b2669",
  "source_manifest_sha256": "38019ac591df057d7522bdaebe885941d97c71aea88cbe324eafa707fce84af8",
  "report_sha256": "55a9eac6aebd052ce55d2f11f8223bd443356e1709ef6867760e1fad75e2265e",
  "checkpoint_sha256": "cd76ebfd9c33a4a4e723023c0fb10d846d08cff9652054b8380571a3c1789871",
  "data_sha256": "9cde8e3acbdef71f2472ae451a3faccd0061eecf00930ef5434ef9fc5d84ac0d",
  "results_sha256": "eebda651640093bf7a31377ba4ff292654f83e45218a034f200e54d86dc8669c",
  "calculation_sha256": "d1b6e8360b88a847316ff7b7c959dbd1ac99da22b0006f4f2aa258841657d90d",
  "verifier_sha256": "46964ade0128d97b589fb678853daf7b81ffff1d90eb1a99221031ba734b093f",
  "next_step_decision_sha256": "e18f450693e2f9a223c9d766722be3415e16bf04e842cf7a57116282ba1f9abc",
  "replay_sha256": "5717a0573678379b08e113aca85ebdb2ada1fe26a7cced77bbdcd67ae9bfae12",
  "control_integrity_sha256": "24e687bf3e03c7f16c3ca2aafe4c72e9aab25f03d55fa644c44a178e698ff3df",
  "readme_sha256": "0f3a339c3eaffc1e41f6b1b857a46b4ad05b3b854d486eebbd7ba036fc686c35",
  "assertions_passed": 2,
  "source_checks_passed": 23,
  "main_result": "Removing SP-companion labels leaves432 records at282 coordinates and34 direct529/1058 pairs, but no shared-word transport. Both2K ladders lose only pivot3620 while retaining every endpoint. The ordinary reflection cycle loses2730; the mixed E cycle loses3765. The two inherited primary Mirror corner controls retain all regular endpoints.",
  "limits": "This is a sensitivity analysis, not a proposal to delete accepted SP companion sources or change the controlling register. Full-register results remain in force.",
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_step_executed": false,
  "next_proposed_step": "Remove only theoretical LXX-Cainan-OFF labels as a separate sensitivity control, retaining SP alternatives, and compare coordinate availability, operator arrows,529 pairs and distinct-record witness assignments."
}