Diablo2D — Shadows of Tristram: complete browser ARPG

- Isometric canvas renderer (depth-sorted, FOV/fog, additive lighting)
- 3 classes x 20 skills, 4 acts x 4 floors + boss lairs, torment I-X
- Diablo-style loot: rarities, affix tiers, 14 legendaries, vendor, stash
- Rogue camp with 6 NPCs: Charsi/Akara/Kashya/Cain/Gheed/storage
- NPC quest chain (accept -> hunt -> turn in) with rewards & gating
- Procedural WebAudio SFX + generative music, EN/VI localization
- Saves, settings, waypoints, hardcore mode, PWA manifest
- 93-assertion headless suite + browser E2E via CDP

tools/cdp_probe.mjs

@@ -0,0 +1,62 @@
+/* CDP probe: launch nothing; attach to an already-running chrome
+   with --remote-debugging-port and interrogate the drive page.
+   usage: node tools/cdp_probe.mjs [port] */
+const port = process.argv[2] || '9333';
+
+const targets = await (await fetch(`http://127.0.0.1:${port}/json`)).json();
+console.log('targets:', targets.map(t => `${t.type}:${t.title}`).join(' | '));
+const page = targets.find(t => t.type === 'page');
+if (!page) { console.log('no page target'); process.exit(1); }
+
+const ws = new WebSocket(page.webSocketDebuggerUrl);
+let id = 0;
+const pending = new Map();
+function send(method, params = {}) {
+  return new Promise((res, rej) => {
+    const mid = ++id;
+    pending.set(mid, { res, rej });
+    ws.send(JSON.stringify({ id: mid, method, params }));
+  });
+}
+ws.onmessage = (ev) => {
+  const msg = JSON.parse(ev.data);
+  if (msg.id && pending.has(msg.id)) {
+    const { res, rej } = pending.get(msg.id);
+    pending.delete(msg.id);
+    msg.error ? rej(new Error(msg.error.message)) : res(msg.result);
+  }
+};
+await new Promise(r => { ws.onopen = r; });
+
+async function evalJs(expr) {
+  const r = await send('Runtime.evaluate', { expression: expr, awaitPromise: true, returnByValue: true, timeout: 8000 });
+  return r.result ? r.result.value : JSON.stringify(r);
+}
+
+const alive = await evalJs('1 + 1');
+console.log('alive:', alive);
+
+const info = await evalJs(`(() => {
+  const f = document.getElementById('g');
+  const w = f && f.contentWindow;
+  if (!w || !w.D2) return 'no game';
+  const D = w.D2;
+  return JSON.stringify({
+    state: D.game.state,
+    time: +(D.game.time||0).toFixed(2),
+    mons: D.game.monsters ? D.game.monsters.length : -1,
+    camx: +D.render.cam.x.toFixed(2),
+    status: document.getElementById('status').textContent.slice(-300),
+  });
+})()`);
+console.log('info:', info);
+
+/* try one manual render with a hard timeout guard */
+const rend = await Promise.race([
+  evalJs(`(() => { const f=document.getElementById('g'); const D=f.contentWindow.D2;
+     const t0=performance.now(); try { D.render.frame(D.game, 1/30); return 'frame ok in '+(performance.now()-t0).toFixed(1)+'ms'; } catch(e){ return 'frame threw: '+e.message; } })()`),
+  new Promise(r => setTimeout(() => r('FRAME HUNG (>8s)'), 8000)),
+]);
+console.log('render:', rend);
+ws.close();
+process.exit(0);