Release v0.12.1

[0.12.1] - 2026-01-07

✨ New Features

• @cartridge/controller: Added configurable error display modes with errorDisplayMode option, enabling developers to control how transaction errors are presented to users with three modes: modal (default), notification (clickable toast), and silent (console only) (#2312)

🚀 Improvements

• Development: Enhanced Claude Code integration with structured skill guides for code review, PR management, testing, Storybook snapshots, and release workflows (#2311, #2310)
• Documentation: Expanded CLAUDE.md with detailed technology stack versions, build process explanations, and comprehensive development workflow guidance (#2310)

🔧 Development

• Build: Added .worktrees to .gitignore for improved Git worktree support (#2311)
• Claude Integration: Added comprehensive permissions configuration and skill documentation for streamlined AI-assisted development (#2311, #2310)