Directory store now sets StoredSchemaId with StoredVersion after a page write (found by main's OwnPushOfALoadedDriftedEntryKeepsExpectHolding). RecordRewrittenUnderAnotherSchema stages the record, since a flush writes only the write set. Variant conflict test expects CultWriteConflictException.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>