feat(mcp): add mcp_paths.toml for multi-project access

- Add mcp_paths.toml with extra_dirs for C:/projects/gencpp
- Update mcp_server.py to read allowed_paths from mcp_paths.toml

mcp_paths.toml

@@ -0,0 +1,4 @@
+[allowed_paths]
+extra_dirs = [
+    "C:/projects/gencpp",
+]

scripts/mcp_server.py

@@ -79,9 +79,18 @@ async def call_tool(name: str, arguments: dict) -> list[TextContent]:
   return [TextContent(type="text", text=f"ERROR: {e}")]
 
 async def main() -> None:
-# Configure mcp_client with the project root so py_* tools are not ACCESS DENIED
  project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
- mcp_client.configure([], extra_base_dirs=[project_root])
+
+ extra_dirs = [project_root]
+ mcp_paths_toml = os.path.join(project_root, "mcp_paths.toml")
+ if os.path.exists(mcp_paths_toml):
+  import tomllib
+  with open(mcp_paths_toml, "rb") as f:
+   config = tomllib.load(f)
+  allowed = config.get("allowed_paths", {}).get("extra_dirs", [])
+  extra_dirs.extend(allowed)
+
+ mcp_client.configure([], extra_base_dirs=extra_dirs)
  async with stdio_server() as (read_stream, write_stream):
   await server.run(
    read_stream,