Mailcat Agent Instructions

Restart Prompt Maintenance

Keep restart_prompt.md as a complete reconstruction prompt for the current commit.
Before every commit, rewrite restart_prompt.md from scratch so it describes the current project state, decisions, constraints, and next expected work.
Do not append chronological notes to restart_prompt.md; replace its contents with the best current prompt.
The file should be sufficient for a fresh Codex thread to understand and continue the project without relying on prior chat history.