T-703 review follow-up: retire only the exact pre-Restore accepted ID, preserve pending deliveries, and retain an explicit deferred Restore recheck when another caller owns the reservation. Atomically release/take deferred work at completion and drain it without holding a Runtime lock.
Regression fixes the independently identified 3174142b interleaving: pause the real reservation before fingerprint comparison and after a no-op match, accept an actual fixture Restore, and verify exactly one new send after reservation completion. Also verify unknown delivery ID/content survive Restore.
Validation: cargo check; cargo test -p yoi-workspace-server (566 lib +11 bin); cargo test -p worker --lib notification_ (14); cargo fmt --all -- --check; git diff --check HEAD. Previous full Worker serial 703 lib+96 integration remains applicable (Worker unchanged in this fix). Tool schema rejection/Reviewer one-call barrier recorded in docs/report.
