{
  "step": "C389",
  "status": "completed",
  "date": "2026-09-24",
  "title": "Cumulative source test of the reflected E/J square",
  "previous_certificate_sha256": "f65875d67866d189f082f4889549a4f501f333fb3912b69b3104993581e83a5e",
  "bindings": {
    "step": "STEP.json",
    "source_manifest": "SOURCE_MANIFEST.json",
    "report": "490d_C389_Reflected_E_J_Square_Cumulative_Source_Test_20260924.md",
    "checkpoint": "490d_Mirror_Checkpoint_After_C389_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": "98e8ac1548b83aac03f7ec0fb4f15ee76ad780e056c34421172ed484e40b4278",
  "source_manifest_sha256": "2b5dd8b9fd3686f9630cf2950e6694239e19ff0d47c72374274e98120f3a338d",
  "report_sha256": "095d81d744032546ff6e504a2d896feade7b2da4be5724a6bf138b3e18e1186c",
  "checkpoint_sha256": "71751a07b3fd845366c5e8a2a00756f631508da6a905ecb9dac3139d8c6eaee4",
  "data_sha256": "a6a8012ea73c345250ecbca06872d437a4f043030e882d27494568c175190d40",
  "results_sha256": "2a1ba86f29518553a2f791287c3bbb72e2411dfe6debc9938c0a59e7c120fcbd",
  "calculation_sha256": "63bd23d5048af201a3388720f60d0304a05e3c847071f6343160513ab76fc2c8",
  "verifier_sha256": "9f175670abb70f7819dd7f6d997ff0bef2e58df8dffd763b433f6c6cd62e332d",
  "next_step_decision_sha256": "f6370261121b1f1b69740d21c3c5a247eacc26205e5d0ab3f506889c1cabdac3",
  "replay_sha256": "fa4d0db4239ee17d48fe76c21544ad660d733da68877323c4e102134260a953c",
  "control_integrity_sha256": "9810807cb07b02f43f568f68bb82cb41a6eeff6799902254b4932e5c350ac838",
  "readme_sha256": "2cbab243a41ef8bc628b2d54e2f6285f40f2bffcfa97517bdc2d66d8f4e12675",
  "assertions_passed": 40,
  "source_checks_passed": 17,
  "main_result": "Both original17K corner exchanges conjugate E/J exactly but leave the reflected Shem input, output and death pivot absent. Ten of16 point slots are sourced; neither cumulative square is complete. Existing phase reversal does not rescue membership. Required outer side1100 differs from2K by42.",
  "limits": "The result is not a proof that a cumulative counterpart can never exist. It is a complete membership check for the stated frozen menu and existing two corner exchanges; no missing point is promoted to a source.",
  "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": "Enumerate the finite coherent regular Noah/Shem/Flood family comparisons without prefiltering on529 or common P/J hits. Ask which adjacent-Gear Noah→Shem E/J squares actually pass, retaining source context, boundary and rail labels.",
  "next_step_executed": false
}