docs: resolve OQ-05 + OQ-09 — queue semantics depth (ADR-010) and scheduler collapse (ADR-009)

ADR-009: scheduler collapses into queues — schedule()/unschedule()/
run_schedules (opt-in, no ambient timers), @every-only v1 grammar
(dissolves honker's local-TZ cron brittleness), boundary guarantee
row (at-least-once per boundary, fixed 64-cap catch-up with
skip-forward, row-locked fire tx as engine-generic no-double-fire
floor), __alkstore_scheduler leadership lock, InvalidSpec +
LeadershipLost taxonomy additions.

ADR-010: queue depth pinned engine-uniformly — three-state machine
(pending/processing/dead) with delete-on-ack, get_job sees dead rows,
heartbeat = renewal with late-heartbeat refusal, reclaim-consumes-
an-attempt stated as contract text, equal-jitter exponential backoff
(range definitionally pinned, 1 h cap), QueueOpts stamped onto job
rows at enqueue (no per-queue registry), move-to-dead dead-letter
with retention-sweep support and no redrive API, sweep_expired
carries the no-stranded-rows property (fixes honker's expired-
processing zombie hole — SQLite-side realization rides OQ-06 as a
concrete fork candidate), one engine-owned pg schema, queues are
rows not tables, result-storage cut-flag stands.

Also: full honker-machinery and pgboss-rs reference reads persisted
(docs/research/reference-*.md — the honker defect list pre-stages the
OQ-06 quality read), queues.md rewritten from design-space frame to
resolved-depth spec, core-contract/engines/README/overview/deployment/
ADR-002 propagated.

docs/architecture/deployment.md

@@ -57,9 +57,10 @@ Shared-server co-tenancy (the alkblobs ADR-008 precedent —
 `/workspace/@alkdev/alkblobs/docs/architecture/decisions/` — consumer
 tables co-tenant the pg instance) is supported and expected — the
 [naming / reserved namespace contract](core-contract.md#naming--reserved-namespace)
-protects reserved names; queue/stream/lock tables are schema-named to
-avoid collisions (layout decision in [queues.md](queues.md), OQ-05's
-namespace bullet).
+protects reserved names; queue/stream/lock/schedule tables live in one
+engine-owned PostgreSQL schema (default `alkstore`, per-engine option)
+— layout per [ADR-010](decisions/010-queue-semantics-depth.md) §8
+(resolved from [queues.md](queues.md)'s namespace bullet).
 
 ## Durability knobs