giles
156d6f12ec
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concurrency.sx: persist/append-expect refuses an append when the stream
advanced past the caller's expected seq, returning {:conflict :expected
:actual} instead of crashing or overwriting. persist/conflict? + accessors.
Phase 2 complete, 54/54.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>