feat(ui-migration): PNG 切分/重组与全量重组校验

切分可逆, 故「重组(切分(原图)) 的像素 === 原图像素」是对全部 1006 帧的完全验证,
成本近零。比较解码后的像素缓冲而非文件字节(编码参数不同会让同像素图字节不同)。
verify-frames CLI 对全部 139 张多帧图跑该校验, 任一失败退出码 1。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

cocoscreator_projects/scripts/verify-frames.mjs

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+import { readFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+import { pathToFileURL } from 'node:url';
+import { loadSource } from './ui-migration/gameabc-source.mjs';
+import { verifySheet } from './ui-migration/frame-io.mjs';
+import { ROOT } from './lib/paths.mjs';
+
+const DEFAULT_SOURCE = join(ROOT, '..', 'projects', 'Game_Surface_3');
+
+/** 对全部多帧图跑重组校验。返回 { checked, failures: [{bmp, reason}] }。 */
+export function verifyAllFrames(projectDir = DEFAULT_SOURCE) {
+  const { images } = loadSource(join(projectDir, 'output'));
+  const failures = [];
+  let checked = 0;
+  for (const image of images.values()) {
+    if (image.frame_all <= 1) continue;
+    const p = join(projectDir, 'assets', 'bmp', image.bmp);
+    if (!existsSync(p)) {
+      failures.push({ bmp: image.bmp, reason: `图片文件不存在: ${p}` });
+      continue;
+    }
+    checked++;
+    const r = verifySheet(readFileSync(p), image);
+    if (!r.ok) failures.push({ bmp: image.bmp, reason: r.reason });
+  }
+  return { checked, failures };
+}
+
+if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
+  const { checked, failures } = verifyAllFrames(process.argv[2] ?? DEFAULT_SOURCE);
+  console.log(`重组校验：${checked} 张多帧图`);
+  if (failures.length === 0) {
+    console.log('OK: 全部通过（切分对全部帧完全可逆）。');
+    process.exit(0);
+  }
+  console.error(`\n${failures.length} 张失败：`);
+  for (const f of failures) console.error(`  ${f.bmp}\n      ${f.reason}`);
+  process.exit(1);
+}