Hardened SQLite concurrent-write safety in `@fusion/core` by auditing WAL enforcement and adding immediate write transactions to prevent stale reads under load, with executor semaphore limit tests in `@fusion/engine` validating the concurrency bounds; added a new `store-concurrent-writes.test.ts` in
Fusion-Task-Id: FN-4083
Fusion-Task-Lineage: adabe51a-a9c4-481a-850d-985c373df51a
Codifies the worktree database open-path hydration failure with a recovery bootstrap mechanism, documented the behavior in storage docs, and added test coverage for the executor hydration degradation path — all gated behind a patch changeset for `@runfusion/fusion`.
Fusion-Task-Id: FN-4039
Implements worktree database hydration for the executor (`worktree-db-hydrate.ts`), enabling the task executor to restore its database state from a worktree on resume, with integration in `executor.ts` and comprehensive test coverage across the new module and worktree scenarios. Documentation and a
Fusion-Task-Id: FN-3841
