fix(connection): reconnect decision closes the failed socket (health_check's documented role) + symmetric backoff-bound test assertion (F3, F5)

tests/test_connection.py

@@ -219,8 +219,8 @@ class TestReconnectBackoff:
         # 5→10→20→40→80→160→300 growth with easing; the last must not exceed
         # the cap (with jitter).
         assert max(delays) <= 300.0 * 1.25
-        assert delays[1] > delays[0] * 1.5
-        assert delays[-1] < 300.0 * 1.25
+        assert delays[1] >= delays[0] * 1.5
+        assert delays[-1] <= 300.0 * 1.25
 
     async def test_repeated_failures_do_not_spam_listeners(self):
         poller = FakePoller()
@@ -245,6 +245,21 @@ class TestReconnectBackoff:
         assert manager._failures == 0
         assert await manager._watchdog_cycle(5.0) == ADB_POLL_INTERVAL
 
+    async def test_failed_wake_poll_forces_reconnect(self):
+        """health_check drives the reconnect decision: a cycle where is_awake
+        fails closes the socket so the next cycle reconnects from scratch."""
+        poller = FakePoller()
+        poller.connected = True
+        poller.awake = None  # wake poll fails while the flag says "connected"
+        manager = _manager(poller)
+
+        delay = await manager._watchdog_cycle(5.0)
+
+        assert 5.0 * 0.75 <= delay <= 5.0 * 1.25  # F5-style symmetric bound
+        assert poller.disconnect_calls == 1
+        assert poller.connected is False
+        assert manager._failures == 1
+
     async def test_connect_failure_clears_stale_store_state(self):
         poller = FakePoller()
         poller.connect_failures = 1