Add /handoff command for session hot-reload

🤝 End watch. Hand off to fresh session, work continues from hook.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/commands/handoff.md

@@ -0,0 +1,12 @@
+---
+description: Hand off to fresh session, work continues from hook
+allowed-tools: Bash(gt recycle)
+---
+
+Execute `gt recycle` to hand off to a fresh session:
+
+```bash
+gt recycle
+```
+
+End watch. A new session takes over, picking up any molecule on the hook.