feat(redis): add channel prefix and error handling

tasks/003-redis-adapter-tests.md

@@ -1,7 +1,7 @@
 ---
 id: redis-adapter-tests
 name: Write tests for Redis event target adapter
-status: pending
+status: completed
 depends_on: [core-pubsub-tests]
 scope: moderate
 risk: medium
@@ -26,15 +26,15 @@ Note: test 7 (error propagation) is partially blocked by the missing error handl
 
 ## Acceptance Criteria
 
-- [ ] `test/event-target-redis.test.ts` exists and passes
-- [ ] Test approach for Redis dependency is decided (mock, container, or ioredis-mock)
-- [ ] Test: dispatchEvent publishes correct channel and serialized envelope
-- [ ] Test: addEventListener subscribes to Redis and dispatches to local listeners
-- [ ] Test: removeEventListener unsubscribes from Redis when no listeners remain
-- [ ] Test: type:id topic scoping works correctly
-- [ ] Test: EventEnvelope round-trips through JSON serialization
-- [ ] Test: multiple listeners on same topic result in single Redis subscribe
-- [ ] Test: custom serializer option works
+- [x] `test/event-target-redis.test.ts` exists and passes
+- [x] Test approach for Redis dependency is decided (mock, container, or ioredis-mock)
+- [x] Test: dispatchEvent publishes correct channel and serialized envelope
+- [x] Test: addEventListener subscribes to Redis and dispatches to local listeners
+- [x] Test: removeEventListener unsubscribes from Redis when no listeners remain
+- [x] Test: type:id topic scoping works correctly
+- [x] Test: EventEnvelope round-trips through JSON serialization
+- [x] Test: multiple listeners on same topic result in single Redis subscribe
+- [x] Test: custom serializer option works
 
 ## References
 
@@ -43,8 +43,14 @@ Note: test 7 (error propagation) is partially blocked by the missing error handl
 
 ## Notes
 
-> To be filled by implementation agent
+Test approach: Manual Redis mock (no external dependencies). The `createMockRedis()` helper creates a lightweight mock that tracks `publish`/`subscribe`/`unsubscribe` calls and provides `simulateMessage()` to trigger the `message` event handler. This avoids needing `ioredis-mock` or a running Redis instance.
+
+Test 7 (error propagation) is not included because the current implementation lacks error handling — tracked in `redis-channel-prefix-and-error-handling` task.
 
 ## Summary
 
-> To be filled on completion
+Implemented comprehensive tests for the Redis event target adapter using a manual mock approach (no external dependencies needed).
+
+- Created: `test/event-target-redis.test.ts` (17 tests across 7 describe blocks)
+- Tests: 17, all passing
+- Coverage: dispatchEvent/publish path, addEventListener/subscribe path, removeEventListener/unsubscribe path, topic scoping, envelope round-trip serialization, multiple listeners (single Redis subscribe), custom serializer, EventListenerObject support