Spread AbsolutePathBuf (#17792)

Mechanical change to promote absolute paths through code.

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -234,7 +234,7 @@ async fn run_codex_tool_session_inner(
                         } = ev;
                         handle_exec_approval_request(
                             command,
-                            cwd,
+                            cwd.to_path_buf(),
                             outgoing.clone(),
                             thread.clone(),
                             request_id.clone(),