fix: Complete lite-fix command with diagnosis workflow and schemas

- Add lite-fix.md command based on lite-plan.md structure
- Create diagnosis-json-schema.json for bug diagnosis results
- Create fix-plan-json-schema.json for fix planning
- Update intelligent-tools-strategy.md: simplify model selection, add 5min minimum timeout
- Fix missing _metadata.diagnosis_index in agent prompt
- Clarify --hotfix mode skip behavior

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: catlog22