test(ext/sw): assert lastCommit URL structure + comment limit/per_page divergence

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

extension/src/service-worker/gitea.ts

@@ -120,6 +120,7 @@ export class GiteaHost implements GitHost {
 
   async lastCommit(path: string): Promise<{ sha: string; author: string; date: string } | null> {
     try {
+      // Gitea uses 'limit'; GitHub's equivalent endpoint uses 'per_page'.
       const url = `${this.commitsUrl}?path=${encodeURIComponent(path)}&limit=1`;
       const resp = await fetch(url, { headers: this.headers });
       if (!resp.ok) return null;