fix(mcp): mcp_client refactor, claude_mma_exec update

scripts/claude_mma_exec.py

@@ -204,7 +204,8 @@ def execute_agent(role: str, prompt: str, docs: list[str]) -> str:
    capture_output=True,
    text=True,
    encoding='utf-8',
-   env=env
+   env=env,
+   creationflags=subprocess.CREATE_NO_WINDOW if hasattr(subprocess, 'CREATE_NO_WINDOW') else 0,
   )
   # claude --print outputs plain text — no JSON parsing needed
   result = process.stdout if process.stdout else f"Error: {process.stderr}"