test: forward HNSW sidecar failure and recovery witness

[RecursiveIntell]

Scope

Dependent on draft #6. Forward-sync tests/storage_lifecycle.rs from the editable Libraries owner at 0b099ec416de60f6adafb182f1d1e83795d05c56; the complete test-file blob matches that owner. The new test deliberately obstructs the local HNSW graph-file path, verifies the SQLite fact remains readable and the pending index operation records a failed attempt, then removes the obstruction and verifies an explicit flush clears pending work and writes the graph file. Add paired-root CI commands for strict Clippy and the four storage_lifecycle tests under hnsw-only. No production-source change.

Evidence

• A disposable paired root with the exact owner test blob passed the focused new test (1), all four lifecycle tests, strict hnsw Clippy, and formatting.
• An exact committed-source assembly at this PR head passed the scratch lock-delta check, strict hnsw test-target Clippy, all four lifecycle tests, and formatting. The paired root is not a claim that the raw standalone checkout builds.
• Hosted paired-root CI run 36492894578 completed successfully at this PR head.

Limits and rollback

This is a deterministic local sidecar-write obstruction with same-process explicit recovery. It does not simulate a process crash/restart or prove ClaimLedger append-to-projection recovery, broad durability, whole-mirror parity, or release readiness. Roll back by closing this dependent draft or reverting the exact two-file commit; do not copy dirty overlays, merge, or activate by implication. Public Evidence Editor and LongMemEval reviewed the narrow candidate at /home/sikmindz/semantic-parity/semantic-memory-sidecar-review-20260928/.