feat(tools): materialize 实体化与皮肤合成

junction 变真实拷贝(发布链路不依赖 junction), 框架真源全程只读。
合成先整体校验再写, 不产生半成品; 例外通道把 override meta 的 uuid
改回框架原值以保持 Prefab 引用不断。

修复：Windows UNC 长路径前缀导致 cpSync filter 中 relative() 失败，
规范化 src 路径后正确计算相对位置进行缓存目录过滤。

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

cocoscreator_projects/scripts/lib/materialize.mjs

@@ -0,0 +1,79 @@
+import { cpSync, mkdirSync, existsSync, readFileSync, writeFileSync, copyFileSync } from 'node:fs';
+import { join, posix, dirname, relative, sep, resolve } from 'node:path';
+import { listAssets, validateOverrides } from './skin.mjs';
+
+/**
+ * 工程缓存目录：实体化时跳过。
+ * **只匹配工程根的直接子目录**——绝不可按目录名在任意层级匹配，否则会连
+ * `assets/game/native/` 这类业务目录一起吞掉（与 .gitignore 无锚点模式同一类错误，见 Task 1）。
+ */
+const CACHE_DIRS = new Set(['library', 'temp', 'local', 'build', 'native', 'profiles', 'node_modules']);
+
+export class SkinValidationError extends Error {
+  constructor(errors) {
+    super(`皮肤覆盖校验未通过（${errors.length} 处问题）`);
+    this.name = 'SkinValidationError';
+    this.errors = errors;
+  }
+}
+
+/**
+ * 把子游戏工程实体化到 destDir：
+ * `assets/framework` 由 junction 变成对 frameworkSrc 的真实目录拷贝；跳过缓存目录。
+ * **frameworkSrc 全程只读**（spec §5.1 ①）。
+ */
+export function materialize(gameDir, frameworkSrc, destDir) {
+  if (existsSync(destDir)) throw new Error(`目标已存在：${destDir}`);
+  mkdirSync(destDir, { recursive: true });
+
+  // 1) 拷工程本体，跳过缓存目录与 assets/framework（后者单独从真源拷）
+  const frameworkLink = join(gameDir, 'assets', 'framework');
+  const gameDirNorm = resolve(gameDir);
+  cpSync(gameDir, destDir, {
+    recursive: true,
+    dereference: true,
+    filter: (src) => {
+      if (src === frameworkLink) return false;
+      // 处理 Windows UNC 长路径前缀 (\\?\) 导致 relative() 失败的问题
+      const srcNorm = resolve(src.replace(/^\\\\\?\\/, ''));
+      const rel = relative(gameDirNorm, srcNorm);
+      if (!rel) return true;                      // gameDir 自身
+      return !CACHE_DIRS.has(rel.split(sep)[0]);  // 只看第一段：锚定到工程根
+    },
+  });
+
+  // 2) 从真源实体化 framework（不依赖 junction 存在，spec §5.1 ②）
+  cpSync(frameworkSrc, join(destDir, 'assets', 'framework'), { recursive: true, dereference: true });
+}
+
+/**
+ * 把临时工程内的 `assets/game/override/**` 合成到 `assets/framework/ui/**`。
+ * 先整体校验，不通过则抛错且**不写任何文件**（避免半成品）。
+ */
+export function composeSkin(destDir) {
+  const frameworkUiDir = join(destDir, 'assets', 'framework', 'ui');
+  const overrideDir = join(destDir, 'assets', 'game', 'override');
+
+  const { matched, errors } = validateOverrides(frameworkUiDir, overrideDir);
+  if (errors.length) throw new SkinValidationError(errors);
+
+  for (const rel of matched) {
+    const parts = rel.split(posix.sep);
+    const from = join(overrideDir, ...parts);
+    const to = join(frameworkUiDir, ...parts);
+    mkdirSync(dirname(to), { recursive: true });
+    copyFileSync(from, to);
+
+    // 例外通道：override 自带 meta 时，把 uuid 改回框架原值以保持引用
+    const ovMeta = `${from}.meta`;
+    const fwMeta = `${to}.meta`;
+    if (existsSync(ovMeta) && existsSync(fwMeta)) {
+      const fwUuid = JSON.parse(readFileSync(fwMeta, 'utf8')).uuid;
+      const merged = JSON.parse(readFileSync(ovMeta, 'utf8'));
+      merged.uuid = fwUuid;
+      writeFileSync(fwMeta, `${JSON.stringify(merged, null, 2)}\n`);
+    }
+  }
+
+  return { matched, frameworkTotal: listAssets(frameworkUiDir).length };
+}

cocoscreator_projects/scripts/test/materialize.test.mjs

@@ -0,0 +1,112 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { join } from 'node:path';
+import { mkdirSync, writeFileSync, readFileSync, existsSync, rmSync, mkdtempSync, symlinkSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { platform } from 'node:process';
+import { materialize, composeSkin, SkinValidationError } from '../lib/materialize.mjs';
+
+const LINK_TYPE = platform === 'win32' ? 'junction' : 'dir';
+
+function put(dir, rel, content) {
+  const p = join(dir, ...rel.split('/'));
+  mkdirSync(join(p, '..'), { recursive: true });
+  writeFileSync(p, content);
+}
+function read(dir, rel) { return readFileSync(join(dir, ...rel.split('/')), 'utf8'); }
+
+/** 造一个「框架真源 + 挂 junction 的子游戏工程」的临时环境 */
+function scaffold() {
+  const root = mkdtempSync(join(tmpdir(), 'youle-mat-'));
+  const frameworkSrc = join(root, 'nexus', 'assets', 'framework');
+  mkdirSync(frameworkSrc, { recursive: true });
+  put(frameworkSrc, 'ui/atlas-hall/btn.png', 'DEFAULT-BTN');
+  put(frameworkSrc, 'ui/atlas-hall/btn.png.meta', '{"uuid":"fw-btn-uuid"}');
+  put(frameworkSrc, 'ui/atlas-hall/bg.png', 'DEFAULT-BG');
+  put(frameworkSrc, 'core/net.ts', 'export const x=1;');
+
+  const gameDir = join(root, 'games', 'demo');
+  mkdirSync(join(gameDir, 'assets'), { recursive: true });
+  writeFileSync(join(gameDir, 'package.json'), JSON.stringify({ name: 'demo', creator: { version: '3.8.8' } }));
+  symlinkSync(frameworkSrc, join(gameDir, 'assets', 'framework'), LINK_TYPE);
+  put(gameDir, 'assets/game/theme.ts', 'export const theme={};');
+  mkdirSync(join(gameDir, 'library'), { recursive: true });   // 缓存目录，应被跳过
+  writeFileSync(join(gameDir, 'library', 'junk'), 'x');
+
+  return { root, frameworkSrc, gameDir, dest: join(root, 'workspace', 'demo') };
+}
+function cleanup(root) { rmSync(root, { recursive: true, force: true }); }
+
+test('materialize 把 junction 变成真实目录拷贝，并跳过缓存目录', () => {
+  const s = scaffold();
+  try {
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    assert.equal(read(s.dest, 'assets/framework/ui/atlas-hall/btn.png'), 'DEFAULT-BTN');
+    assert.equal(read(s.dest, 'assets/game/theme.ts'), 'export const theme={};');
+    assert.ok(!existsSync(join(s.dest, 'library')), 'library 应被跳过');
+  } finally { cleanup(s.root); }
+});
+
+test('materialize 只跳过工程根的缓存目录，不吞 assets 下的同名业务目录', () => {
+  const s = scaffold();
+  try {
+    put(s.gameDir, 'assets/game/native/bridge.ts', 'BRIDGE');
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    assert.equal(read(s.dest, 'assets/game/native/bridge.ts'), 'BRIDGE', 'assets 下的 native 是业务目录，必须保留');
+    assert.ok(!existsSync(join(s.dest, 'library')), '工程根的 library 仍应被跳过');
+  } finally { cleanup(s.root); }
+});
+
+test('materialize 后写临时工程不影响框架真源', () => {
+  const s = scaffold();
+  try {
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    writeFileSync(join(s.dest, 'assets', 'framework', 'ui', 'atlas-hall', 'btn.png'), 'MUTATED');
+    assert.equal(read(s.frameworkSrc, 'ui/atlas-hall/btn.png'), 'DEFAULT-BTN', '真源必须只读');
+  } finally { cleanup(s.root); }
+});
+
+test('materialize 拒绝覆盖已存在的目标目录', () => {
+  const s = scaffold();
+  try {
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    assert.throws(() => materialize(s.gameDir, s.frameworkSrc, s.dest), /已存在/);
+  } finally { cleanup(s.root); }
+});
+
+test('composeSkin 用 override 覆盖框架资源内容，保留框架 .meta', () => {
+  const s = scaffold();
+  try {
+    put(s.gameDir, 'assets/game/override/atlas-hall/btn.png', 'SKINNED-BTN');
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    const r = composeSkin(s.dest);
+    assert.deepEqual(r.matched, ['atlas-hall/btn.png']);
+    assert.equal(r.frameworkTotal, 2);
+    assert.equal(read(s.dest, 'assets/framework/ui/atlas-hall/btn.png'), 'SKINNED-BTN');
+    assert.equal(read(s.dest, 'assets/framework/ui/atlas-hall/btn.png.meta'), '{"uuid":"fw-btn-uuid"}');
+    assert.equal(read(s.dest, 'assets/framework/ui/atlas-hall/bg.png'), 'DEFAULT-BG', '未覆盖的保持默认');
+  } finally { cleanup(s.root); }
+});
+
+test('composeSkin 例外通道：override 自带 meta 时，uuid 被改回框架的值', () => {
+  const s = scaffold();
+  try {
+    put(s.gameDir, 'assets/game/override/atlas-hall/btn.png', 'SKINNED-BTN');
+    put(s.gameDir, 'assets/game/override/atlas-hall/btn.png.meta', '{"uuid":"game-own-uuid","ver":"1.0.0"}');
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    composeSkin(s.dest);
+    const meta = JSON.parse(read(s.dest, 'assets/framework/ui/atlas-hall/btn.png.meta'));
+    assert.equal(meta.uuid, 'fw-btn-uuid', 'uuid 必须沿用框架的');
+    assert.equal(meta.ver, '1.0.0', 'override meta 的其余字段保留');
+  } finally { cleanup(s.root); }
+});
+
+test('composeSkin 校验不过时抛 SkinValidationError 且不写任何文件', () => {
+  const s = scaffold();
+  try {
+    put(s.gameDir, 'assets/game/override/atlas-hall/typo.png', 'X');
+    materialize(s.gameDir, s.frameworkSrc, s.dest);
+    assert.throws(() => composeSkin(s.dest), SkinValidationError);
+    assert.equal(read(s.dest, 'assets/framework/ui/atlas-hall/btn.png'), 'DEFAULT-BTN', '失败时不得部分写入');
+  } finally { cleanup(s.root); }
+});