- Add proper frontmatter to all emptied tier-specific agents
- Mark them as hidden subagents with deprecation notice
- Ensures they cannot be accessed as primary agents
- Completes the tier selector architecture migration
All deprecated agents now have:
mode: subagent
hidden: true
description: "This subagent should only be called manually by the user."
This prevents accidental usage of the deprecated agents while maintaining
the clean tier selector architecture where only 6 primary agents are
accessible to users.