{
  "schemaVersion": 1,
  "publicSummaryVersion": "2026-09-30",
  "classification": "PUBLIC",
  "title": "Historical checkpoint portability and integrity test",
  "summary": "On 28 July 2026, a laboratory test restored a session from its stored checkpoint on a second service instance, created branches with recorded ancestry, and rejected corrupted checkpoint data. An interrupted checkpoint publication left the prior checkpoint intact. Both service instances ran on the same laboratory host with compatible software and local storage; this was not a cross-host disaster-recovery test. Branch differences came from staggered execution, not agent steering.",
  "date": "28 July 2026",
  "scope": "Laboratory or bench evidence; production behavior is not inferred from it.",
  "result": "On 28 July 2026, a laboratory test restored a session from its stored checkpoint on a second service instance, created branches with recorded ancestry, and rejected corrupted checkpoint data. An interrupted checkpoint publication left the prior checkpoint intact. Both service instances ran on the same laboratory host with compatible software and local storage; this was not a cross-host disaster-recovery test. Branch differences came from staggered execution, not agent steering.",
  "sections": [],
  "currentDeployment": "Not independently verified by this historical evidence.",
  "canonical": "/evidence/phase-2b"
}