Bootstrap project and safe work-item workflow

delivery_backlog/stories/US04-03-rename-apply.md

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+# US04-03 — Apply and Verify Guarded Renames
+
+Epic: [E04](../E04-guarded-renaming.md)
+
+As a user, I want confirmed plans applied without overwrites so reorganizing the
+library preserves identity and bytes.
+
+## Acceptance criteria
+
+- Apply requires current plan/version confirmation and an exclusive mutation lease.
+- Preconditions are rechecked immediately before each mutation; unexpected targets
+  are never overwritten.
+- Case-only and cross-filesystem operations use safe staged procedures.
+- Postconditions verify bytes and paths, update occurrences, and reconcile stable IDs.
+
+## Automated tests
+
+- Filesystem integration tests cover normal, case-only, collision, cross-filesystem,
+  stale source, and repeated apply.
+- Tests assert byte preservation and database/path consistency after restart.
+
+## Dependencies
+
+- US04-02