Queue-type triggers with a durable local queue

[blakebauman]

Context

Highest-leverage net-new feature for the agent-runtime story after the reliability work. Triggers supported cron and webhook; this adds event-driven work: a type = "queue" trigger drains a message queue and delivers each message to the app, waking it first — so an agent processes a backlog at $0 idle cost between bursts.

Branched from a clean main.

What changed

• config — new queue trigger type and queue field; validation requires a delivery path.
• store — a durable SQLite-backed queue (queue_messages): publish, atomic claim (with a visibility timeout so a crashed delivery is redelivered), ack (delete), and requeue. This is the verified local provider.
• control — RunQueueTriggers poller claims messages, wakes the app, and POSTs each body to the trigger path (X-Fold-Trigger / X-Fold-Message-Id headers). At-least-once: acked only on a 2xx; failures and stale claims are redelivered.
• api / client / CLI — POST /v1/apps/{app}/triggers/{name}/publish and fold triggers publish <name> [--body | stdin].

Cloud sources (next step, intentionally not in this PR)

AWS SQS / GCP Pub/Sub slot in behind the same poller via the queue config field (already carries the queue URL/name). Left gated/unimplemented until run against the real target, per the repo's verified-core convention — so this PR ships only code that's actually exercised.

Tests

• store: publish/claim/ack/requeue, claimed messages aren't double-claimed, and stale-claim redelivery
• control: delivery acks on 2xx and requeues on 5xx (real httptest backend)
• config: queue trigger requires a path; type/method parsed correctly

Verification

• gofmt -l clean · go vet ./... clean · go test ./... all pass · go build -tags firecracker ./... compiles
• Manual: deployed a scale-to-zero app with a queue trigger, fold triggers published two messages, and watched the poller wake the app and deliver each body — 200, then acked — confirmed in both the structured control log (queue message delivered) and the app activity stream (queue jobs delivered message to / -> 200 OK), no retries

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