chore: update tool config (#4755)

## Summary
Updates tool config for gpt-5-codex

## Test Plan
- [x] Ran locally
- [x]  Updated unit tests

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

@@ -21,6 +21,7 @@ use serde_json::Value;
 use wiremock::matchers::any;
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+#[ignore = "disabled until we enable read_file tool"]
 async fn read_file_tool_returns_requested_lines() -> anyhow::Result<()> {
     skip_if_no_network!(Ok(()));