sqlite: run_schedules' failed-renewal arm classifies as Database, never LeadershipLost (review 004 item 9) — a lost lease (Ok(false)) keeps the respawn arm unchanged; a failed renewal (closed store / storage failure) propagates its opaque classification, so respawning misdirects at a dead store no more; dated (2026-10-11) ADR-017 §2 class-1 annotation of the loss-vs-failure arm set in ADR-009 §1, core-contract §Errors, queues.md, engine-sqlite.md, core+sqlite doc comments; two tests pin both arms; pg twin recorded for follow-up; task -> completed

docs/architecture/engine-sqlite.md

@@ -83,7 +83,7 @@ per-contract obligations live in the core spec and are not restated here.
 | streams | the forked substrate's stream machinery (inherited near-verbatim — the `__alkstore_stream` table's field set is already the contract's shape (its `topic` column carries the contract's `stream` field — the one name delta, ADR-012 §3's fidelity posture), the offset-ASC read path, keyed publish's nullable key column, monotone offset saves ([ADR-015](decisions/015-streams-depth.md)); explicit offset saves through the tx seam; `trim_to` is a `DELETE FROM … WHERE offset <= ?` inside the writer-slot lease) |
 | queues | owned queue machinery (forked substrate re-derived on [ADR-010](decisions/010-queue-semantics-depth.md) — stamps, no-stranded-rows sweep, dead-visible `get_job`); ADR-003's ride posture superseded on ownership by [ADR-011](decisions/011-sqlite-substrate-fork.md) |
 | named locks | the substrate's lock machinery (`lock_renew` carries the renew semantics the guarantee row pins; re-acquire does not refresh TTL — inherited deliberately, [ADR-012](decisions/012-forked-substrate-design.md) §4) |
-| scheduler / outbox | collapse shape ([ADR-009](decisions/009-scheduler-collapse.md)): owned scheduler storage (`__alkstore_scheduler_tasks`, forked substrate) carrying `@every` specs (cron machinery not ported); the 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) |
+| scheduler / outbox | collapse shape ([ADR-009](decisions/009-scheduler-collapse.md)): owned scheduler storage (`__alkstore_scheduler_tasks`, forked substrate) carrying `@every` specs (cron machinery not ported); the 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). The loss decision is one owner — the loop's top-of-iteration renew: a refused renewal (`Ok(false)`, lease expired and re-acquired elsewhere) exits with `LeadershipLost`; a *failed* renewal is not a loss and propagates its opaque `Database` classification unchanged — the closed-store posture (a dead store must not misdirect the respawn recipe, review 004 item 9, annotated 2026-10-11 per [ADR-009](decisions/009-scheduler-collapse.md) §1) and every other renewal failure |
 | 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 |