feat(node): push USB changes and preserve sensor setup across sessions

tests/fleet/test_events.py

@@ -0,0 +1,23 @@
+import asyncio
+import threading
+
+from k1link.fleet.events import FleetEvents
+
+
+def test_registry_events_cross_thread_coalesce_and_unsubscribe():
+    async def check():
+        events = FleetEvents()
+        queue, close = events.subscribe()
+        thread = threading.Thread(target=lambda: [events.notify() for _ in range(20)])
+        thread.start()
+        thread.join()
+        await asyncio.sleep(0)
+        assert queue.qsize() == 1
+        await queue.get()
+        close()
+        events.notify()
+        await asyncio.sleep(0)
+        assert queue.empty()
+        assert not events.listeners
+
+    asyncio.run(check())