Expose owned C breakpoints through shared MCP session

toolchain/sdbg/mcp_adapter.py

@@ -77,6 +77,9 @@ class McpSession:
     def screenshot(self):
         return self.call('screenshot')
 
+    def list_breakpoints(self):
+        return self.call('list_breakpoints')
+
     def press_key(self, key: str, frames: int = 3):
         """Один физический PC-key с отпусканием даже при stop/ошибке."""
         from mame_interactive import SHIFT_KEY, resolve