fix: standardize filename to kebab-case 🐍➡️🥙 (#302)

Probably not the most exciting PR you’ll get today, but I noticed that
every file in the repo follows kebab-case… except one brave little
underscore in `cli_singlepass.tsx`.

So I made the world a little more consistent. Just a filename rename —
no logic changes, no semicolons harmed

Didn’t touch any code, I promise. Just bringing order to the filesystem
— one hyphen at a time.

codex-cli/src/cli-singlepass.tsx

@@ -0,0 +1,28 @@
+import type { AppConfig } from "./utils/config";
+
+import { SinglePassApp } from "./components/singlepass-cli-app";
+import { render } from "ink";
+import React from "react";
+
+export async function runSinglePass({
+  originalPrompt,
+  config,
+  rootPath,
+}: {
+  originalPrompt?: string;
+  config: AppConfig;
+  rootPath: string;
+}): Promise<void> {
+  return new Promise((resolve) => {
+    render(
+      <SinglePassApp
+        originalPrompt={originalPrompt}
+        config={config}
+        rootPath={rootPath}
+        onExit={() => resolve()}
+      />,
+    );
+  });
+}
+
+export default {};