Add shared-session MCP source debugger adapter

tests/sdbg/test_session.py

@@ -127,6 +127,25 @@ class SessionTests(unittest.TestCase):
                       bridge.calls)
         session.clear_breakpoint(result['id'])
 
+    def test_partial_breakpoint_clear_retains_remaining_backend_id(self):
+        class FlakyBridge(FakeBridge):
+            failed = False
+
+            def request(self, command, **args):
+                if command == 'clear' and args['id'] == 11 and not self.failed:
+                    self.failed = True
+                    raise SessionError('временная ошибка удаления')
+                return super().request(command, **args)
+
+        bridge = FlakyBridge(self.memory)
+        session = DebugSession(self.model, bridge)
+        session.breakpoints[1] = [10, 11]
+        with self.assertRaisesRegex(SessionError, 'временная ошибка'):
+            session.clear_breakpoint(1)
+        self.assertEqual(session.breakpoints[1], [11])
+        self.assertEqual(session.clear_breakpoint(1)['backend_ids'], [11])
+        self.assertNotIn(1, session.breakpoints)
+
     def test_stale_source_and_unmapped_bank_are_rejected(self):
         session = DebugSession(self.model, FakeBridge(self.memory))
         session.attach()