chore(spec): 综合清理 + legacy-layer 迁移 spec/plan/data

主要改动:
- 切到 funplay-cocos-mcp v0.5.1 (用户级配置, 项目级 .mcp.json 删除)
- 仓库文档/CLAUDE.md/.gitignore 等清理过时 cocos-mcp-server 引用
- memory 文件同步: cocos-mcp-setup/path/blocker/spriteframe-uuid/prefab-persist 等加 funplay 实测警告
- memory 新建 funplay-cocos-mcp-pending-verification.md (后已被实测覆盖)
- spec/plan/data:
  - docs/superpowers/specs/2026-09-02-legacy-layer-migration-design.md
  - docs/superpowers/plans/2026-09-02-legacy-layer-migration.md
  - docs/superpowers/data/layer-spirit-summary.json
- YouleNexus: profiles.ts / defaults.ts / PlayerInfoView.prefab / scene 改动

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

cocoscreator_projects/scripts/test/ui-coords.test.mjs

@@ -1,15 +1,25 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import {
-  DESIGN_WIDTH, DESIGN_HEIGHT,
+  DESIGN_WIDTH, DESIGN_HEIGHT, CANVAS_WIDTH, CANVAS_HEIGHT,
   toCocosPosition, inferWidget, stretchWidget, isFullScreen, isOffscreen,
 } from '../ui-migration/coords.mjs';
 
-test('设计分辨率保持 1280x720', () => {
+test('内容区基准保持 1280x720（数据源事实，不随设计分辨率改变）', () => {
   assert.equal(DESIGN_WIDTH, 1280);
   assert.equal(DESIGN_HEIGHT, 720);
 });
 
+test('设计分辨率画布为 1600x720（20:9 主流移动端比例）', () => {
+  assert.equal(CANVAS_WIDTH, 1600);
+  assert.equal(CANVAS_HEIGHT, 720);
+});
+
+test('内容区基准与设计分辨率画布是两个独立常量', () => {
+  // 坐标/三区/满屏/越界用 DESIGN_WIDTH（1280）；落地 Layer/Group 尺寸用 CANVAS_WIDTH（1600）。
+  assert.notEqual(DESIGN_WIDTH, CANVAS_WIDTH);
+});
+
 test('toCocosPosition 用 spec 的验算样例', () => {
   // spec §1.2: Left=320 Top=200 150x70 → x=-245 y=125
   assert.deepEqual(toCocosPosition(320, 200, 150, 70), { x: -245, y: 125 });