fix: add close() lifecycle methods to all adapters, fix WS client handler preservation, add Worker thread context guard

- Add close() to Redis, WS Client, WS Server, Worker Host, Worker Thread adapters
  for graceful teardown (cleanup subscriptions, restore handlers, clear maps)
- WS Client now saves/restores original onmessage (consistent with WS Server)
- WS Client dispatchEvent/addEventListener/removeEventListener are no-ops after close()
- WS Server close() removes all connections and clears local listeners
- Redis close() unsubscribes all channels and removes message listener
- Worker Host/Thread close() restore original onmessage and clear callbacks
- Worker Thread throws clear error if globalThis.postMessage is unavailable
- Add double-call guard to WS Server removeConnection
- Export new adapter interface types (RedisEventTarget, WebSocketClientEventTarget, etc.)
- Add sideEffects: false to package.json for tree-shaking
- Update architecture docs: lifecycle section, close() contract, adapter status updates
- 22 new tests covering close(), handler restoration, idempotency, and context guard

docs/architecture/build-distribution.md

@@ -28,22 +28,25 @@ No logger dependency. No TypeBox dependency (call protocol and schemas moved to
     types.ts                 # TypedEvent, TypedEventTarget, EventEnvelope
     create_pubsub.ts         # createPubSub factory (adapted from graphql-yoga)
     operators.ts             # filter, map, pipe, take, reduce, toArray,
-                             #   batch, dedupe, window, flat, groupBy, chain, join
+                              #   batch, dedupe, window, flat, groupBy, chain, join
     repeater.ts              # Inlined from @repeaterjs/repeater (MIT)
     event-target-redis.ts    # createRedisEventTarget (peer dep: ioredis)
-    # Future adapters (each is its own entry point + peer dep island):
-    # event-target-websocket.ts  # (peer dep: none, web standard)
-    # event-target-worker.ts     # (peer dep: none, web standard)
+    event-target-websocket-client.ts  # createWebSocketClientEventTarget
+    event-target-websocket-server.ts  # createWebSocketServerEventTarget, WebSocketLike, SpokeEventTarget
+    event-target-worker.ts   # createWorkerHostEventTarget, createWorkerThreadEventTarget
+    # Future adapters:
     # event-target-iroh.ts       # (peer dep: @rayhanadev/iroh)
   test/
     create_pubsub.test.ts
     operators.test.ts
     event-target-redis.test.ts
-    # event-target-websocket.test.ts
-    # event-target-worker.test.ts
-    # event-target-iroh.test.ts
+    event-target-websocket-client.test.ts
+    event-target-websocket-server.test.ts
+    event-target-worker.test.ts
+    integration-pubsub-redis.test.ts
+    integration-websocket.test.ts
   docs/
-    architecture.md
+    architecture/
     architecture/
     research/
   package.json
@@ -61,7 +64,8 @@ We use explicit sub-path exports rather than barrel-only + tree-shaking. Each ad
   "exports": {
     ".": { ... },
     "./event-target-redis": { ... },
-    "./event-target-websocket": { ... },
+    "./event-target-websocket-client": { ... },
+    "./event-target-websocket-server": { ... },
     "./event-target-worker": { ... },
     "./event-target-iroh": { ... }
   }