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/009-websocket-server-tests.md

@@ -0,0 +1,55 @@
+---
+id: websocket-server-tests
+name: Write tests for WebSocket server event target adapter
+status: pending
+depends_on: [websocket-server-adapter, websocket-client-tests]
+scope: moderate
+risk: medium
+impact: component
+level: implementation
+---
+
+## Description
+
+Write tests for `createWebSocketServerEventTarget`. This requires mocking multiple WebSocket connections and simulating the fan-out behavior.
+
+Test scenarios from the architecture doc:
+1. Topic-based fan-out — dispatchEvent sends only to connections subscribed to that event type
+2. Subscription protocol — `__subscribe`/`__unsubscribe` control events correctly update the subscription map
+3. Incoming aggregation — messages from any spoke dispatch to local listeners
+4. Connection add/remove — new connections are tracked, disconnections clean up all subscriptions
+5. Backpressure disconnect — slow consumers exceeding threshold are disconnected
+6. Backpressure callback — `onBackpressure` is called before disconnecting
+7. Direct messaging — events dispatched to `"direct:${spokeId}"` reach only the target spoke
+8. Mixed topology — server adapter and client adapters can communicate bidirectionally
+
+## Acceptance Criteria
+
+- [ ] `test/event-target-websocket-server.test.ts` exists and passes
+- [ ] Mock strategy for multiple WebSocket connections established
+- [ ] Test: `addConnection`/`removeConnection` track connections correctly
+- [ ] Test: `__subscribe` control event adds connection to topic's subscriber set
+- [ ] Test: `__unsubscribe` control event removes connection from topic's subscriber set
+- [ ] Test: `dispatchEvent` sends only to connections subscribed to that topic
+- [ ] Test: connections NOT subscribed to a topic do NOT receive events for that topic
+- [ ] Test: malformed JSON from spokes is silently ignored
+- [ ] Test: invalid `__subscribe` with empty/malformed topic is ignored
+- [ ] Test: backpressure threshold disconnect — connections exceeding `maxBufferedAmount` are closed with code 1013
+- [ ] Test: `onBackpressure` callback fires before disconnect
+- [ ] Test: `onConnection` callback receives spoke target and WebSocket
+- [ ] Test: `onDisconnection` callback fires on connection close
+- [ ] Test: `dispatchEvent` always returns `true`
+- [ ] Test: send failure (ws.send throws) removes connection and fires `onDisconnection`
+
+## References
+
+- docs/architecture/event-targets/websocket-server.md (Test Plan section)
+- src/event-target-websocket-server.ts
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion