Contract-suite scaffold: alkstore-contract-suite crate + ADR-022 (suite layout decision), engine dev-dep edges (ADR-017 §4.2 discharged, ADR-012 §2 mirror)

docs/architecture/overview.md

@@ -1,6 +1,6 @@
 ---
 status: draft
-last_updated: 2026-10-07 (ADR-021 — third review round: tx reads, value-shape fixes, schedule queue validation, drop=rollback, receiver arms)
+last_updated: 2026-10-07 (ADR-022 — contract-suite layout: shared internal suite crate)
 ---
 
 # alkstore — Overview
@@ -85,6 +85,7 @@ Per [ADR-002](decisions/002-feature-scope.md):
 | [019](decisions/019-mechanism-handle-surfaces.md) | Mechanism-handle surfaces (handle traits, `Job`/`Schedule` shapes, `worker_id`, `StopToken`) | Accepted |
 | [020](decisions/020-enqueue-opt-semantics-and-bridges.md) | Enqueue-option semantics (delay/run_at, expires, scheduler stamp source, payload encoding) | Accepted |
 | [021](decisions/021-tx-reads-and-value-shape-fixes.md) | Third review round (tx-read methods on `TxHandle`, `Job.claimed_at`, `schedule()` queue-argument validation, drop = rollback, receiver close/error arms) | Accepted |
+| [022](decisions/022-contract-suite-layout.md) | Contract-suite layout (shared internal suite crate, store-factory parameterization) | Accepted |
 
 ## Non-goals