Lists all valid issue types with descriptions, organized by category: - Work types (task, bug, feature, chore, epic) - System types (molecule, gate, convoy, merge-request, slot) - Agent types (agent, role, rig, event, message) Supports --json output for scripting. Closes: bd-9ilm5 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>