Clear a fault once its check stops reporting it

Found in today's power-off test: a Shure/PSM check reports "conn" while its
connection is down and per-channel results once it is back, so the
"AXIENT 1 OFFLINE" tracker never saw OK. The button looked green, but no
CLEAR was logged and a hold on RF would still have restarted the Shure
connections. A tracker missing from a round now gets an OK update.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_status_panel.py

@@ -545,6 +545,18 @@ class TestFixes(unittest.TestCase):
         for fix_id in ("obs", "arena", "vista"):                             # never closes a running app
             self.assertTrue(CONFIG["fixes"][fix_id]["run"].startswith("tasklist "), fix_id)
 
+    def test_shure_back_online_clears_and_holds_do_nothing(self):
+        self.snap.conns["Axient_1"]["category"] = "error"
+        run_steps(self.engine, self.snap, SUNDAY, 4)
+        self.assertEqual(self.plan("rf"), [("restart", "Axient_1")])
+        self.engine.events.clear()
+        self.snap.conns["Axient_1"]["category"] = "good"                   # back: now reported per channel
+        tiles, _ = run_steps(self.engine, self.snap, SUNDAY + 5, 2)
+        self.assertEqual(tiles["rf"]["x"], "RF\nOK")
+        self.assertIn(("CLEAR", "AXIENT 1 OFFLINE"), self.engine.events)
+        self.assertEqual(self.plan("rf"), [])                              # nothing left to "fix"
+        self.assertFalse(self.engine.failing("rf"))
+
     def test_midi_reconnect_where_the_peer_was_last_seen(self):
         others = [{"name": "SuperRack-LiveBox", "address": "10.1.13.140:5004", "state": "running"},
                   {"name": "Studio B Mac Studio", "address": "\tStudio B Mac Studio\tlocal.", "state": "running"}]