Expand MCP tool catalog cache regression coverage (#33308)

## Why

Cached MCP tool catalogs must not substitute stale session state for the live
server connection.

## What changed

- Verify `mcpServerStatus/list` waits for replacement stdio server metadata
  before combining it with cached tools.
- Verify configurations with remotely sourced environment variables bypass the
  tool catalog cache.
- Assert that calls made from cached definitions return output from the live
  replacement process.
- Make the stdio test server available to Windows Bazel integration tests.

GitOrigin-RevId: 0e518cd46f0d89af28e3a4e256023b5872e6e2fb

codex-rs/core/tests/suite/mcp_tool_cache.rs

@@ -267,6 +267,14 @@ async fn regular_mcp_definition_cache_preserves_live_session_state() -> anyhow::
         output.contains(&expected_error),
         "model-visible tool output should contain the live visibility error: {output}"
     );
+    let output = cached_done_response
+        .single_request()
+        .function_call_output_text("cached-call")
+        .expect("successful tool output should be returned to the model");
+    assert!(
+        output.contains(&second_process),
+        "model-visible tool output should come from the live server: {output}"
+    );
 
     second_thread.shutdown_and_wait().await?;
     responses_server.verify().await;