log python path for diag

demo/health.py

@@ -119,6 +119,12 @@ def _check_mcp_health() -> ToolStatus:
     )
     env = os.environ.copy()
     env["PYTHONPATH"] = py_path
+    logging.warning(
+        "MCP probe spawning server: cmd=%s args=%s PYTHONPATH=%s",
+        sys.executable,
+        ["-m", "aileen3_mcp.server"],
+        py_path,
+    )
 
     transport = StdioTransport(
         command=sys.executable,