{
  "step": "C290",
  "date": "2026-09-24",
  "status": "completed",
  "title": "Dilation of the four-node source pattern",
  "previous_certificate_sha256": "a145d187ae90582a1133a856adaa7aa95b25e613f7226a41c5b0c1f26888d6d2",
  "source_manifest_sha256": "4f246530ffff720576f3087a99a9b1fee5c54f9c1b124ef9286cf29927b3a396",
  "step_sha256": "e7a04891e6c1609eb2914b1b7fa983d0ee88b76ed84ba7ab5d976cbb0bc6cb9b",
  "report_sha256": "a213410602e804d832a5137e4bdb911caa968bce3034fe3b6d0db5cad4af72e4",
  "checkpoint_sha256": "f129142d6f4376dfd29ee23a0d338efafc789411c93a006722950677b1dbf9b1",
  "results_sha256": "62cf6d0052d7fe4fb19cd0309aa7f04eabed6b676f435acf0b406c550d7920c3",
  "data_sha256": "dfdd3391d2ffd418d97134a10ae52f0986f680052454de5565514245c9735cc8",
  "calculation_sha256": "39d66879b7e2bfd16886424459e7e2a88d2fd44f7026ef21b644420a6b0432ae",
  "verifier_sha256": "1b0d77f7bd90c94c014bf13467830ac053579a4ca021d6d777d8442441f73259",
  "review_sha256": "8959b6356305bf858fee1b271a836f440bda30ceb25e073354493e46a0dde2a9",
  "replay_sha256": "8a76159f396a19b1de359add0234c49deda9e24e50cae561c95585b810644c3c",
  "control_integrity_sha256": "7d55ffe99d593f94d5565c8c6301a449eb4cc7b03956b4db28299117f407543d",
  "next_step_decision_sha256": "34073ba3a9db714522ce0e9a7d632271baacca47768fb8302e29e1389901adb0",
  "assertions_passed": 27,
  "source_checks_passed": 7,
  "frozen_inputs": 5,
  "main_result": "Fixed25/23 dilation has six offset-anchored Flood center matches but no complete physical-pair transport; it does not preserve the four-node source pattern.",
  "limits": [
    "Center coincidence is weaker than physical-pair transport.",
    "Per-row anchored dilations are not one global affine map.",
    "The negative extension result leaves the exact scalar identity intact."
  ],
  "canonical_or_graph_edits": false,
  "new_independent_agent_review": false,
  "next_proposed_step": "C291: apply the existing8464=16K translation to the four-node pattern and test its relation to the retained regular endpoints.",
  "next_step_executed": false
}