Enable coordinated MCP OAuth refresh (#42413)

## What changed

- Honor `McpOAuthRefreshMode::Coordinated` for streamable HTTP MCP connections by letting RMCP refresh and persist credentials through the pinned credential store.
- Reread credentials while holding the refresh lock, persist refreshed tokens before retrying requests, and serialize login and logout writes with in-flight refreshes.
- Keep OAuth preparation outside MCP operation and handshake deadlines, and allow refresh persistence to finish if the initiating caller is cancelled.

## Testing

- Cover coordinated startup refresh, concurrent refreshes, `401` retries, credential mutation races, provider timeouts, and caller cancellation.

GitOrigin-RevId: 100ae788048087be23e26bb43f868b1fcebb007a

codex-rs/cli/src/mcp_cmd.rs

@@ -660,7 +660,9 @@ async fn run_logout(config: &Config, logout_args: LogoutArgs) -> Result<()> {
         &url,
         config.mcp_oauth_credentials_store_mode,
         config.auth_keyring_backend_kind(),
-    ) {
+    )
+    .await
+    {
         Ok(true) => println!("Removed OAuth credentials for '{name}'."),
         Ok(false) => println!("No OAuth credentials stored for '{name}'."),
         Err(err) => return Err(anyhow!("failed to delete OAuth credentials: {err}")),