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/001-core-pubsub-tests.md

@@ -0,0 +1,50 @@
+---
+id: core-pubsub-tests
+name: Write tests for createPubSub, EventEnvelope, and in-process event target
+status: pending
+depends_on: []
+scope: moderate
+risk: low
+impact: component
+level: implementation
+---
+
+## Description
+
+The core `createPubSub` factory, `EventEnvelope` type, and the in-process (default `EventTarget`) path have no tests. These are the foundation of the entire package — every adapter builds on `createPubSub`. Write comprehensive tests that verify the core contract.
+
+The architecture specifies these behaviors:
+- `createPubSub()` with no config uses `new EventTarget()` (in-process)
+- `createPubSub({ eventTarget })` uses a custom event target
+- `publish(type, id, payload)` dispatches a `CustomEvent` with type `"type:id"` and `detail` as `EventEnvelope`
+- `subscribe(type, id)` returns a `Repeater<EventEnvelope>` (async iterable)
+- `publish` throws on event types starting with `__` (reserved for adapter control)
+- Topic scoping uses the `type:id` convention
+- `subscribe` cleanup: breaking out of the `for await` loop removes the listener
+
+## Acceptance Criteria
+
+- [ ] `test/create_pubsub.test.ts` exists and passes
+- [ ] Test: `publish` dispatches event with correct `type:id` topic
+- [ ] Test: `publish` throws on `__`-prefixed event types
+- [ ] Test: `subscribe` returns async iterable that yields `EventEnvelope` objects
+- [ ] Test: `subscribe` envelope has correct `type`, `id`, `payload` fields
+- [ ] Test: subscriber receives events only for the subscribed topic (type:id matching)
+- [ ] Test: multiple subscribers on the same topic all receive events
+- [ ] Test: subscriber cleanup — breaking out of `for await` loop removes the listener
+- [ ] Test: `createPubSub` with custom `eventTarget` dispatches to that target
+- [ ] Test: `createPubSub` without `eventTarget` uses `new EventTarget()` (in-process)
+
+## References
+
+- docs/architecture/api-surface.md
+- src/create_pubsub.ts
+- src/types.ts
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion