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Preserve concurrent edits and durable repair recovery - #73
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Repair publication now captures the actual prior file before publishing without replacing a concurrent writer. Rollback checks the current version and retains conflict material instead of overwriting newer edits. Same-filesystem and link support are checked; a short name-switch window and interrupted-operation recovery are documented.
Repair snapshots persist in an owned private directory with checksums and a 16-operation retention limit; CLI backup-check is read only. Workbench backups live under its private state. History publishes complete indexes last and reports retained incomplete material separately.
Validation: reproduced the four original failures, the final-publication conflict and unsupported-filesystem case before their fixes; typecheck/lint; 783 full tests passed, one existing Docker test skipped; final 43 domain/workbench checks passed after the publication preflight change. Existing root-replacement and immutable-history assertions are retained with the corresponding filesystem fixture. No production, real user data, model or payment calls.