test: 目录对齐赛道二成果物规范（tests/ 迁移+实验报告+提效测量脚本）

- src/test 迁移至根目录 tests/（16 测试 + fixtures/manual），导入改为 ../src/
- 新增 tsconfig.test.json 独立编译测试；.vscode-test.mjs / package.json / .gitignore 同步
- 新增 tests/test-execution-log.md、tests/test-cases.md（116 用例清单）
- 新增 tests/measure/measure-review-time.mjs + performance-comparison.md（提效测量）
- 重命名 3 个中文报告文件为 demo-*-coverage-report.md
- git rm --cached 解除 vsix 跟踪；README 标注演示视频进行中

tests/measure/results/measure-results.json

@@ -0,0 +1,19 @@
+{
+  "tool": "code-reviewer",
+  "measureDate": "2026-08-26T11:16:33.653Z",
+  "rows": [
+    {
+      "target": "demo-eslint",
+      "files": 6,
+      "ms": 192.1965,
+      "diagnostics": 294
+    },
+    {
+      "target": "demo-stylelint",
+      "files": 2,
+      "ms": 2106.6858,
+      "diagnostics": 115
+    }
+  ],
+  "totalMs": 2298.8823
+}