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Add a thin in-memory pubsub broker and a SharedWorker-based WebSocket client to deliver real-time notification count updates. This replaces the SSE path for notification-count events with a persistent WebSocket connection shared across all tabs. New files: - services/pubsub/broker.go: fan-out pubsub broker (DefaultBroker singleton) - services/websocket/notifier.go: polls notification counts, publishes to broker - routers/web/websocket/websocket.go: /-/ws endpoint, per-user topic subscription - web_src/js/features/websocket.sharedworker.ts: SharedWorker with exponential backoff reconnect (50ms initial, 10s max, reconnect on close and error) Modified files: - routers/init.go: register websocket_service.Init() - routers/web/web.go: add GET /-/ws route - services/context/response.go: add Hijack() to forward http.Hijacker so coder/websocket can upgrade the connection - web_src/js/features/notification.ts: port from SSE SharedWorker to WS SharedWorker - webpack.config.ts: add websocket.sharedworker entry point Part of RFC #36942.