Summary

• speed up openclaw-runtime installs by adding a cached postinstall flow that skips reinstalling when tracked runtime install inputs have not changed
• keep first-time installs faster by preferring lockfile-driven install behavior, while falling back from npm ci to npm install --prefer-offline when the runtime lockfile is not strict enough for CI npm
• parallelize runtime pruning, share the runtime exists() helper, and add focused tests for cache fingerprint changes including missing tracked files

Notes

• cache invalidation now includes the Node.js version, so upgrading Node forces a runtime reinstall automatically
• removing the old unconditional preinstall clean is intentional: pnpm install no longer self-heals a corrupted openclaw-runtime/node_modules, and pnpm openclaw-runtime:reinstall remains the manual recovery path
• parallel pruning assumes pruneTargets does not contain overlapping parent/child paths

Verification

• pnpm lint
• pnpm vitest run tests/openclaw-runtime/postinstall-cache.test.ts
• PR CI is green