FC-atomic-replace-ignores-host-file-sharing.json

{
  "schema_version": 1,
  "id": "FC-atomic-replace-ignores-host-file-sharing",
  "violated_contract": "An atomic status writer must tolerate the file-sharing rules of every supported host. On Windows, a reader that has the destination open without delete sharing can briefly make os.replace fail with PermissionError; treating that transient sharing violation as a permanent write failure aborts the single-flight owner while another process is only polling its status.",
  "canonical_prevention": "Keep the write-to-temp-and-replace primitive, but retry only Windows PermissionError failures for a short bounded interval so an active reader can release the destination. Preserve immediate failure for other platforms and errors, and run a native Windows regression that holds the destination open while the writer attempts the swap.",
  "canonical_prevention_artifact": [
    ".github/scripts/test_preflight_runner.py"
  ],
  "evidence_prs": [],
  "scope_hints": [
    ".github/scripts/preflight_runner.py",
    ".github/scripts/test_preflight_runner.py"
  ],
  "status": "open"
}