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/build_zip.mjs

@@ -0,0 +1,76 @@
+/* ============================================================
+ * tools/build_zip.mjs — package the game for itch.io.
+ * Store-only ZIP (no deps). Excludes tools/ and dev files.
+ *   node tools/build_zip.mjs
+ * ============================================================ */
+import fs from 'node:fs';
+import path from 'node:path';
+
+const CRC_TABLE = (() => {
+  const t = new Int32Array(256);
+  for (let n = 0; n < 256; n++) {
+    let c = n;
+    for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
+    t[n] = c;
+  }
+  return t;
+})();
+function crc32(buf) {
+  let c = 0xffffffff;
+  for (let i = 0; i < buf.length; i++) c = CRC_TABLE[(c ^ buf[i]) & 0xff] ^ (c >>> 8);
+  return (c ^ 0xffffffff) >>> 0;
+}
+
+const ROOT = path.join(process.cwd());
+const INCLUDE = ['index.html', 'manifest.webmanifest', 'LICENSE', 'README.md', 'server.js', 'css', 'js', 'icons'];
+const EXCLUDE_DIR = new Set(['tools', 'node_modules', '.git']);
+
+function walk(rel, out) {
+  const full = path.join(ROOT, rel);
+  const st = fs.statSync(full);
+  if (st.isDirectory()) {
+    if (EXCLUDE_DIR.has(path.basename(rel))) return;
+    for (const name of fs.readdirSync(full)) walk(path.join(rel, name), out);
+  } else {
+    out.push({ rel: rel.split(path.sep).join('/'), full });
+  }
+}
+const files = [];
+for (const f of INCLUDE) if (fs.existsSync(path.join(ROOT, f))) walk(f, files);
+
+/* ---- assemble store-only zip ---- */
+const locals = [];
+const centrals = [];
+let offset = 0;
+const u16 = v => { const b = Buffer.alloc(2); b.writeUInt16LE(v); return b; };
+const u32 = v => { const b = Buffer.alloc(4); b.writeUInt32LE(v); return b; };
+
+for (const f of files) {
+  const data = fs.readFileSync(f.full);
+  const name = Buffer.from(f.rel, 'utf8');
+  const crc = crc32(data);
+
+  const lh = Buffer.concat([
+    u32(0x04034b50), u16(20), u16(0), u16(0), u16(0x21), u16(0),
+    u32(crc), u32(data.length), u32(data.length), u16(name.length), u16(0), name,
+  ]);
+  locals.push(lh, data);
+
+  centrals.push(Buffer.concat([
+    u32(0x02014b50), u16(20), u16(20), u16(0), u16(0), u16(0x21), u16(0),
+    u32(crc), u32(data.length), u32(data.length), u16(name.length), u16(0), u16(0),
+    u16(0), u16(0), u32(0), u32(offset), name,
+  ]));
+  offset += lh.length + data.length;
+}
+
+const cdBuf = Buffer.concat(centrals);
+const eocd = Buffer.concat([
+  u32(0x06054b50), u16(0), u16(0), u16(files.length), u16(files.length),
+  u32(cdBuf.length), u32(offset), u16(0),
+]);
+
+const zip = Buffer.concat([...locals, cdBuf, eocd]);
+const outName = 'diablo2d-itch.zip';
+fs.writeFileSync(path.join(ROOT, outName), zip);
+console.log(`wrote ${outName}: ${files.length} files, ${(zip.length / 1024).toFixed(1)} KB`);