Overnight mini-App Builder：夜间自动产出可试用微应用

• A clearly scoped mini-app PRD (1-page) and acceptance criteria are ready.
• Repo has CI/lint/build scripts so night runs can fail fast.

1. Split work into phases: scaffold → core feature → tests → demo doc.
2. Run long tasks overnight with checkpoints written to state files.
3. Auto-open PR draft with TODO tags for risky or uncertain sections.
4. Morning review: only merge after human pass on acceptance criteria.

• Night runs can drift scope; enforce hard token/time budgets.
• Any deployment step should remain manual approval gated.

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