Verify visible hello MCP run and add shared control lease

toolchain/sdbg/dap.py

@@ -54,6 +54,11 @@ class DapEngine:
                                        'description': self._description(location)}))
             return {}, events
         if command == 'disconnect':
+            if self.attached is not None:
+                try:
+                    self.rpc('release_control')
+                except (SessionError, OSError):
+                    pass
             return {}, events
         if command == 'threads':
             return {'threads': [{'id': 1, 'name': 'Sprinter Z80'}]}, events
@@ -118,7 +123,8 @@ class DapEngine:
 
     def poll_events(self, timeout=1):
         previous = self.event_sequence
-        result = self.rpc('events', {'after': self.event_sequence, 'timeout': timeout},
+        result = self.rpc('events', {'after': self.event_sequence, 'timeout': timeout,
+                                     'owner': 'cli'},
                           timeout=timeout + 2)
         self.event_sequence = result['last']
         translated = []