When gt sling is used without an existing convoy context, automatically
create a convoy for dashboard visibility. This ensures all work appears
in 'gt convoy list', even "swarm of one" assignments.
Changes:
- Add --no-convoy flag to skip auto-convoy creation
- Check if issue is already tracked by a convoy before creating new one
- Create convoy with title "Work: <issue-title>" and add tracks relation
- Display tracking info in sling output
- Update command help with auto-convoy documentation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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