Decompose architecture into atomic, dependency-ordered tasks

19 tasks covering core testing, Redis hardening, WebSocket client/server
adapters, Worker adapter, and final review gates. Iroh adapters are tracked
as a deferred placeholder blocked on the @alkdev/iroh fork.

Phases: core validation → Redis hardening → review gate → WebSocket
adapters → review gate → Worker adapter → review gate → final validation.

tasks/011-worker-adapter-rd.md

@@ -0,0 +1,41 @@
+---
+id: worker-adapter-rd
+name: R&D on Worker adapter: Node vs Web Worker API differences
+status: pending
+depends_on: [review-core-and-redis]
+scope: narrow
+risk: medium
+impact: component
+level: implementation
+---
+
+## Description
+
+The Worker adapter has an open question documented in `docs/architecture/event-targets/worker.md`: should we implement one adapter that targets Web Workers (browser + Deno + Bun), two separate adapters for Node `worker_threads` and Web Workers, or one adapter abstracting both?
+
+The architecture doc recommends starting with a single adapter targeting Web Workers (browser + Deno + Bun all support this API). Node `worker_threads` support would be added later.
+
+This R&D task should:
+1. Evaluate the API differences between Web Worker (`self.onmessage`/`self.postMessage`) and Node `worker_threads` (`parentPort.on('message')`/`parentPort.postMessage()`)
+2. Determine if a single adapter abstraction is feasible and worth the complexity
+3. Decide on the initial scope: Web Worker only, or both from the start
+4. Identify any polyfills or compatibility shims needed
+
+## Acceptance Criteria
+
+- [ ] R&D notes documented on the API differences between Web Worker and Node worker_threads
+- [ ] Decision made on scope: single Web Worker adapter, or dual adapter from the start
+- [ ] If dual adapter, create separate task for the Node worker_threads variant
+- [ ] If single adapter, identify what runtime detection or abstraction is needed
+
+## References
+
+- docs/architecture/event-targets/worker.md (Open Questions section)
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion