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/engine-sqlite.md

@@ -52,9 +52,9 @@ spec and are not restated here.
 |---|---|
 | notify / listen | honker's notify functions inside the caller's tx; `listen()` bridges the watcher's fanout into a tokio receiver (one `spawn_blocking` thread per subscription doing `blocking_send`) |
 | streams | honker's stream machinery; explicit offset saves through the tx seam |
-| queues | honker's queue functions ([ADR-002](decisions/002-feature-scope.md)); semantics depth design in [queues.md](queues.md) |
+| queues | honker's queue functions ([ADR-002](decisions/002-feature-scope.md)); semantics depth per [ADR-010](decisions/010-queue-semantics-depth.md) — ride + pin, except two contract properties honker's machinery doesn't provide (the no-stranded-rows `sweep_expired`, dead-row `get_job` visibility — OQ-06's concrete fork candidates) |
 | named locks | honker's lock machinery |
-| scheduler / outbox | honker's counterparts, per [queues.md](queues.md) |
+| scheduler / outbox | collapse shape ([ADR-009](decisions/009-scheduler-collapse.md)): honker's scheduler machinery (`_honker_scheduler_tasks`) carries `@every` specs (its cron boundary machinery unused — cron strings are contract-rejected); honker's leader loop pattern (TTL lock, heartbeat, exit-before-tick-on-loss); the leadership lock is `__alkstore_scheduler`; outbox = helper over queues with the derived backing-queue name ([ADR-008](decisions/008-contract-v1-pinning.md) §4) |
 | begin_tx | acquires the writer slot, opens `BEGIN IMMEDIATE`, returns the caller-held handle ([ADR-007](decisions/007-transactional-seam.md)) |
 | handle ops | each `*_tx` op round-trips `spawn_blocking` to the same connection (thread-affinity note in [ADR-007](decisions/007-transactional-seam.md)) |
 | commit/rollback | releases the writer slot |
@@ -102,6 +102,8 @@ consumption stands.
 | [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) |
+| [009](decisions/009-scheduler-collapse.md) | Scheduler collapse | honker scheduler machinery with `@every` specs; `__alkstore_scheduler` leadership; cron machinery unused |
+| [010](decisions/010-queue-semantics-depth.md) | Queue depth | ride + pin over honker's functions; §5/§3a properties are OQ-06 fork candidates |
 
 ## Open Questions
 
@@ -109,7 +111,12 @@ Open questions are tracked in
 [open-questions.md](open-questions.md). Key
 questions affecting this document:
 
-- **OQ-06**: honker-core quality read — fork-trigger assessment (open)
-- **OQ-09**: scheduler collapse into queues (shared with
-  [queues.md](queues.md)) (open)
-- **OQ-05**: queue semantics depth on honker's machinery (open)
+- **OQ-06**: honker-core quality read — fork-trigger assessment
+  (open); now carrying two concrete candidates from the queue-depth
+  design (no-stranded-rows sweep, dead-row visibility —
+  complement vs fork is the read's call)
+
+Resolved: **OQ-09** (scheduler collapse —
+[ADR-009](decisions/009-scheduler-collapse.md)) and **OQ-05** (queue
+semantics depth — [ADR-010](decisions/010-queue-semantics-depth.md)),
+2026-10-05.