Fix websocket reconnecting after intentional stop

When Home Assistant shuts down, the websocket stop() method sets state to
STOPPED, but the running() coroutine's else block unconditionally calls
retry(), causing an unwanted reconnection attempt. Add a _closing flag to
distinguish intentional stops from unexpected disconnections, so only the
latter trigger automatic reconnection.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sebr

custom_components/bhyve/pybhyve/websocket.py

@@ -47,6 +47,7 @@ def __init__(
         self._heartbeat_cb = None
         self._heartbeat: int = 25
         self._ws: ClientWebSocketResponse | None = None
+        self._closing: bool = False
 
     def _cancel_heartbeat(self) -> None:
         if self._heartbeat_cb is not None:
@@ -172,12 +173,16 @@ async def running(self) -> None:  # noqa: PLR0912, PLR0915
             self.retry()
 
         else:
-            _LOGGER.info("Reconnecting websocket; state: %s", self.state)
-            self.retry()
+            if self._closing:
+                _LOGGER.info("Websocket closed intentionally, not reconnecting")
+            else:
+                _LOGGER.info("Reconnecting websocket; state: %s", self.state)
+                self.retry()
 
     async def stop(self) -> None:
         """Close websocket connection."""
         _LOGGER.info("Closing websocket connection; state: %s --> STOPPED", self.state)
+        self._closing = True
         self.state = STATE_STOPPED
         self._cancel_heartbeat()
         if self._ws is not None: