## Summary
- Updated Supabase prompt to emphasize using the `execute_sql` tool for
database operations
- Changed documentation to clarify that users should not manually create
migration files
- Added warning that migration files in `supabase/migrations/` are
automatically generated

## Test plan
- Review the updated prompt content in `src/prompts/supabase_prompt.ts`
- Verify that the guidance is clear about using execute_sql tool
- Ensure migration file warning is prominent

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