Saved mid-pass after a workstation crash: per-entry Expect and ExpectUnchanged
on the one-store batch, TryCommit, a lock sidecar for the single-file store,
the last-writer-wins flush contract, the race tests and probe P7, and full
CultLib\packages paths for sibling runtimes. The Imagination pass is finishing
the rest.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>