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Document the window after the final mask check - #232
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Source masks are checked as late as practicable and ordinary concurrent edits are detected, but the files are not locked, so a change between the final check and the manifest replace is not detected; the manifest binds the bytes as they were at that check (owner decision of 8 November 2026). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Scma6W3LC11s3qjXHZuGDm
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Fixes #222
Docs only. Per the owner decision of 8 November 2026 (document, do not snapshot),
docs/contract.md(§9.4, "Source changes during a run", where the final mask check before the commit is described) now states that:os.replace, inbefore_commit) and ordinary concurrent edits are detected;A CHANGELOG line is added under Unreleased. No code changes.
python tools/check.pyon the branch (extras.[dev,notebook,zarr]): 4694 passed, 4 skipped (case-insensitive file system and file-mode permission skips), code rules clean.Generated by Claude Code