Generic BackgroundWorkerPool<Req, Resp> with crossbeam channels, closure
handlers, and 3 delivery strategies (Fallback, GracefulDegrade, ModalLock).
Stub workers registered as Bevy resources:
- ChunkGenWorker (2 threads) — terrain/props/navmesh generation
- NpcPrepWorker (1 thread) — pre-compute NPC state for incoming areas
- OffscreenTickWorker (1 thread) — advance NPCs outside active tier
Tick loop integration:
- PreInput: poll_worker_results drains completed work
- PostSnapshot: push_worker_requests queues new work (no-op until Phase 5)
Handlers are stubs — real computation plugs in when the phases that need
them arrive. The infrastructure (channels, threads, push/poll, shutdown)
is real and tested.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
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