Preserve working directories when importing external sessions (#36964)

## Why

Cursor stores projectless chats under the reserved `empty-window` project, and
their transcripts may not contain embedded working-directory metadata.

## What changed

- Resolve `empty-window` sessions to the parent of the Cursor home directory,
  including when that home is configured as a relative path.
- Record each created or appended session's working directory in its import
  success result instead of inheriting the migration item's directory.

## Testing

- Cover projectless Cursor transcripts without embedded metadata.
- Cover working-directory resolution from a relative Cursor home.

GitOrigin-RevId: 21cc7ea6acab1ed80cc4016a881e07eca3d0abbd

codex-rs/external-agent-migration/src/detect/sessions/cur.rs

@@ -38,7 +38,7 @@ pub(crate) fn detect_recent_cur_sessions_with_limits(
         if !project_storage.is_dir() {
             continue;
         }
-        let fallback_cwd = cur_project_cwd(&project_storage);
+        let fallback_cwd = cur_project_cwd(&project_storage, external_agent_home);
         for path in cur_transcript_files(&project_storage.join("agent-transcripts")) {
             candidates.push(SessionFileCandidate {
                 path,
@@ -79,8 +79,17 @@ fn cur_transcript_files(transcripts_root: &Path) -> Vec<PathBuf> {
     files
 }
 
-fn cur_project_cwd(project_storage: &Path) -> Option<PathBuf> {
+fn cur_project_cwd(project_storage: &Path, external_agent_home: &Path) -> Option<PathBuf> {
     let encoded = project_storage.file_name()?.to_str()?;
+    // Cursor stores projectless chats under this reserved project name.
+    if encoded == "empty-window" {
+        let external_agent_home = if external_agent_home.is_absolute() {
+            external_agent_home.to_path_buf()
+        } else {
+            std::env::current_dir().ok()?.join(external_agent_home)
+        };
+        return external_agent_home.parent().map(Path::to_path_buf);
+    }
     decode_cur_project_path(encoded)
 }
 

codex-rs/external-agent-migration/src/detect/sessions/cur_tests.rs

@@ -34,6 +34,43 @@ fn detects_cur_transcript_with_project_cwd() {
     );
 }
 
+#[test]
+fn detects_projectless_cur_transcript_without_embedded_metadata() {
+    let root = TempDir::new().expect("tempdir");
+    let external_agent_home = root.path().join(".cursor");
+    let transcript = write_transcript(
+        &external_agent_home,
+        "empty-window",
+        "projectless-session",
+        "first request",
+    );
+
+    let sessions =
+        detect_recent_cur_sessions(&external_agent_home, root.path()).expect("detect sessions");
+
+    assert_eq!(
+        sessions,
+        vec![ExternalAgentSessionMigration {
+            path: transcript,
+            cwd: root.path().to_path_buf(),
+            title: Some("first request".to_string()),
+        }]
+    );
+}
+
+#[test]
+fn resolves_projectless_cur_cwd_from_relative_home() {
+    let current_dir = std::env::current_dir().expect("current dir");
+
+    assert_eq!(
+        cur_project_cwd(
+            Path::new(".cursor/projects/empty-window"),
+            Path::new(".cursor"),
+        ),
+        Some(current_dir)
+    );
+}
+
 #[test]
 fn detects_cur_transcript_with_embedded_unc_cwd() {
     let root = TempDir::new().expect("tempdir");