[feat] no-ticket - add manifest endpoint test helper

[mariojgt]

Summary

• add a Bun-powered manifest endpoint smoke-test helper
• support auto-provisioning when no site UUID is provided
• document local endpoint testing in the README

Validation

• bun run test:manifest --dry-run
• npm test
• npm run typecheck
• npm run build

[mariojgt]

/review

[coderbuds]

Useful CLI script with clear structure and consistent error handling.

🎯 Quality: 92% Elite · 📦 Size: Large — consider splitting if possible

📈 This month: Your 98th PR — above team average · Averaging Excellent

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