docs: resolve OQ-04 — contract v1 pinned (ADR-008): surface partition, TxHandle-on-handle-trait, Wake/WakeReceiver, reserved __alkstore_ namespace, error taxonomy, engine-crate constructors, locks guarantee row

docs/architecture/engine-sqlite.md

@@ -1,6 +1,6 @@
 ---
 status: draft
-last_updated: 2026-10-04
+last_updated: 2026-10-05
 ---
 
 # SQLite engine
@@ -101,6 +101,7 @@ consumption stands.
 | [005](decisions/005-dependency-ownership.md) | Ownership | published honker-core; named fork triggers |
 | [006](decisions/006-wake-and-delivery-contract.md) | Wake contract | data_version watcher, coalescing, death-closes-receivers |
 | [007](decisions/007-transactional-seam.md) | Tx seam | writer-slot lease, `BEGIN IMMEDIATE`, `spawn_blocking` round-trips |
+| [008](decisions/008-contract-v1-pinning.md) | Contract v1 | pinned surface; outbox backing queue derived under the reserved prefix; wake payload transport unused (non-contract) |
 
 ## Open Questions