- Add WORKTREE_CHECK_PR_STATUS config (default: true) - Add pr_url and branch_name fields to session files - Add check_pr_status() to query PR status via API (Gitea/GitHub) - Add update_session_pr_url() to update PR URL in session - Add kugetsu update-pr command to set PR URL - Modify cmd_destroy to check PR status before destroying worktree Closes #135