Add TownBeadsPrefix constant to agent_ids.go to centralize the "hq" prefix string used for town-level agent beads. This makes prefix changes easier and reduces string duplication. Also update agent_beads_check.go to use the helper functions instead of hardcoded strings for consistency. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>