feat(session): implement background job runner with queue and lifecycle events #6036
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…ation PR1 of async subagent delegation stack (Issue sst#5887). This commit introduces the SessionRunner namespace which provides a unified interface for executing session loops: - runOnce(): Synchronous execution wrapping SessionPrompt.prompt (implemented) - runBackground(): Fire-and-forget execution for async delegation (scaffold only) - Options/RunResult types for future background execution - State tracking infrastructure for active background runs No behavior change - this is purely an abstraction layer. Next: PR2 will implement runBackground() with lifecycle events.
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…le events - Add Job, JobKind, JobStatus, EnqueueOptions schemas - Add enqueue(), cancel(), get(), list() APIs - Add lifecycle events (Queued, Started, Completed, Failed, Canceled, TimedOut) - Add configurable timeout and concurrency via experimental.backgroundTasks - Fix: queue now restarts after idle (removed stale started flag) - Fix: dedupe now returns completion promise, not immediate job reference
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Implements the background job queue for async subagent delegation (#5887).
Stacked on #5996 — review/merge that first, then rebase this PR.
Changes:
enqueue()with FIFO queue, deduplication, concurrency limit (default 2)session.background.{queued,started,completed,failed,canceled,timed_out}Promise.race+ AbortControllercancel(),get(),list()helpersexperimental.backgroundTasks.{timeoutMs,maxConcurrent}