- persistLeaseLocked now returns error; AcquireLease rolls back in-memory
lease on DB failure so memory and PG stay consistent
- appendAuditLocked uses request ctx and logs audit INSERT failures
instead of swallowing them with context.Background()
- loadDocumentFromDBLocked now SELECTs lease_fencing_token so fencing
survives process restart
- SaveDocumentContent/RecordDocumentViewed/RecordDocumentEdited/
DecideModificationProposal/SetDocumentWorkDir log persist failures
via slog.Error instead of silent _, _
Co-authored-by: Cursor <cursoragent@cursor.com>