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/overview.md

@@ -55,7 +55,7 @@ Per [ADR-002](decisions/002-feature-scope.md):
 | [core-contract.md](core-contract.md) | The unified trait surface: mechanisms, delivery guarantees, tx seam, naming |
 | [engine-sqlite.md](engine-sqlite.md) | SQLite engine: mapping the contract onto honker-core/rusqlite |
 | [engine-postgres.md](engine-postgres.md) | Postgres engine: mapping the contract onto tokio-postgres/LISTEN |
-| [queues.md](queues.md) | Queue/scheduler/outbox semantics depth (OQ-05/OQ-09) |
+| [queues.md](queues.md) | Queue/scheduler/outbox semantics depth (ADR-009/ADR-010 resolved) |
 | [deployment.md](deployment.md) | Host capabilities, connection budgets, deployment matrix (OQ-08) |
 | [open-questions.md](open-questions.md) | OQ-01..NN tracker |
 | [decisions/](decisions/) | ADRs |
@@ -72,6 +72,8 @@ Per [ADR-002](decisions/002-feature-scope.md):
 | [006](decisions/006-wake-and-delivery-contract.md) | Opaque wake + re-read; notify-vs-streams guarantee split | Accepted |
 | [007](decisions/007-transactional-seam.md) | Caller-held `TxHandle` with `*_tx` methods | Accepted |
 | [008](decisions/008-contract-v1-pinning.md) | Contract v1 surface pinning (partition, TxHandle shape, wake type, reserved strings, error taxonomy) | Accepted |
+| [009](decisions/009-scheduler-collapse.md) | Scheduler collapse (queues + `schedule()`, `@every`-only) | Accepted |
+| [010](decisions/010-queue-semantics-depth.md) | Queue semantics depth (visibility, backoff, dead-letter, sweep, layout) | Accepted |
 
 ## Non-goals