Add cwd to memory files (#11591)

Add cwd to memory files so that model can deal with multi cwd memory
better.

---------

Co-authored-by: jif-oai <jif@openai.com>

codex-rs/state/src/runtime.rs

@@ -2093,8 +2093,10 @@ WHERE kind = 'memory_stage1'
         assert_eq!(outputs.len(), 2);
         assert_eq!(outputs[0].thread_id, thread_id_b);
         assert_eq!(outputs[0].rollout_summary, "summary b");
+        assert_eq!(outputs[0].cwd, codex_home.join("workspace-b"));
         assert_eq!(outputs[1].thread_id, thread_id_a);
         assert_eq!(outputs[1].rollout_summary, "summary a");
+        assert_eq!(outputs[1].cwd, codex_home.join("workspace-a"));
 
         let _ = tokio::fs::remove_dir_all(codex_home).await;
     }
@@ -2163,6 +2165,7 @@ VALUES (?, ?, ?, ?, ?)
         assert_eq!(outputs.len(), 1);
         assert_eq!(outputs[0].thread_id, thread_id_non_empty);
         assert_eq!(outputs[0].rollout_summary, "summary");
+        assert_eq!(outputs[0].cwd, codex_home.join("workspace-non-empty"));
 
         let _ = tokio::fs::remove_dir_all(codex_home).await;
     }