Coordinates zen Issue-driven development workflow including branch creation,
PR management, and GitHub Projects integration. Activates when user mentions
"start issue", "create PR", "next steps", "workflow", "zen", "branch naming",
"commit format", "Issue作業", "ブランチ", "コミット規約", "PR作成",
"作業開始", "ワークフロー", "次のステップ", "ブランチ命名", or asks about
development workflow. Use for workflow state detection, phase transitions,
and command suggestions.