Add AppendRouteToDir helper and use it to add hq-* route during rig initialization. This allows rig beads to resolve role beads and other hq-* prefixed beads stored in town beads. Uses safe append pattern (load, merge, write) instead of overwriting to avoid clobbering future rig routes. Supersedes PR #184 with proper implementation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>