Enumerate failing specs/E2E from CI artifacts; mute all github-actions comments

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DgBEW6qAwgn2fcQbA2f4ZQ

server/github/rest.ts

@@ -0,0 +1,29 @@
+import { getToken } from './token.js';
+import { GithubError } from './client.js';
+
+const BASE = 'https://api.github.com';
+
+export async function restJson<T>(path: string): Promise<T> {
+  const res = await fetch(`${BASE}${path}`, {
+    headers: {
+      authorization: `bearer ${getToken()}`,
+      accept: 'application/vnd.github+json',
+      'user-agent': 'pr-monitor',
+    },
+  });
+  if (!res.ok) {
+    throw new GithubError(`GitHub REST ${path}: ${res.status}`);
+  }
+  return res.json() as Promise<T>;
+}
+
+/** Download an artifact zip (follows the storage redirect). */
+export async function restZip(path: string, maxBytes: number): Promise<Uint8Array | null> {
+  const res = await fetch(`${BASE}${path}`, {
+    headers: { authorization: `bearer ${getToken()}`, 'user-agent': 'pr-monitor' },
+  });
+  if (!res.ok) throw new GithubError(`GitHub REST ${path}: ${res.status}`);
+  const buf = new Uint8Array(await res.arrayBuffer());
+  if (buf.byteLength > maxBytes) return null;
+  return buf;
+}