fix: make pnpm test reliable

[lodystage]

Summary

• build the ACP adapters before the recursive workspace test run so a clean checkout has every exported adapter module
• force NODE_ENV=test through cross-env so caller shell state cannot load React production-only behavior
• deterministically drain virtual file-tree timers during test teardown to prevent post-environment callbacks

Testing

• pnpm test
• pnpm check:quick
• pnpm install --frozen-lockfile
• focused managed-runtime and virtual-file-tree Vitest suites