阶段0-基线与护栏: 修复不可移植/抖动测试全绿(341过), vitest串行执行防桌面竞争, 新增运行时能力注册快照(909个id)

package.json

@@ -12,6 +12,7 @@
     "preview": "electron-vite preview",
     "typecheck": "tsc --noEmit -p tsconfig.json",
     "catalog": "node scripts/build-catalog.mjs",
+    "snapshot": "vitest run scripts/capability-snapshot.test.ts",
     "package": "node scripts/package.mjs",
     "test": "vitest run",
     "test:e2e": "node scripts/demo-e2e.mjs"