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/decisions/002-feature-scope.md

@@ -43,7 +43,12 @@ has recorded the need):
 - **scheduler** — cron/`@every` enqueueing into named queues,
   leader-elected. Documented-thin; the family-wide
   "who sweeps/renews/reaps" need. May collapse into queues if design
-  shows scheduler = queues + tick (tracked in OQ-09).
+  shows scheduler = queues + tick (tracked in OQ-09). *(Narrowed
+  2026-10-05 by [ADR-009](009-scheduler-collapse.md): collapsed to
+  queues + `schedule()`/`run_schedules`, spec grammar `@every`-only —
+  the "cron" label reflected honker's menu, not any inventory row's
+  body; no consumer names wall-clock cron — grammar pinned by
+  [ADR-009](009-scheduler-collapse.md) §2.)*
 
 **Cut-flag** (no named consumer; not silently included):