codex: normalize schema fixture TS paths (#13593)

codex-rs/app-server-protocol/src/export.rs

@@ -1994,7 +1994,7 @@ pub(crate) fn generate_index_ts_tree(tree: &mut BTreeMap<PathBuf, String>) {
         .collect::<Vec<_>>();
     if !v2_entries.is_empty() {
         tree.insert(
-            PathBuf::from("v2/index.ts"),
+            PathBuf::from("v2").join("index.ts"),
             index_ts_entries(&v2_entries, false),
         );
     }

codex-rs/app-server-protocol/src/schema_fixtures.rs

@@ -277,6 +277,7 @@ fn collect_typescript_fixture_file<T: TS + 'static + ?Sized>(
     }
 
     let contents = T::export_to_string().context("export TypeScript fixture content")?;
+    let output_path = normalize_relative_fixture_path(&output_path);
     files.insert(
         output_path,
         contents.replace("\r\n", "\n").replace('\r', "\n"),
@@ -295,6 +296,10 @@ fn collect_typescript_fixture_file<T: TS + 'static + ?Sized>(
     Ok(())
 }
 
+fn normalize_relative_fixture_path(path: &Path) -> PathBuf {
+    path.components().collect()
+}
+
 fn visit_typescript_fixture_dependencies(
     files: &mut BTreeMap<PathBuf, String>,
     seen: &mut HashSet<TypeId>,