Claude Code v2.0+ moved from .claude/commands/ to .claude/skills/.
This adds the handoff skill in the new format so workers can use
/handoff to cycle to fresh sessions.
The skill wraps `gt handoff` with optional message support.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
