v2.0.0 of arcle

Agentic Flutter Development Platform — scaffold Clean Architecture projects with BLoC, GetX, or Riverpod, and configure AI agent support. Changelog excerpt: ARCLE Agentic Flutter Development Platform ### New Commands - arcle agent add — scaffold agent-specific config files (.claude/, .codex/, .gemini/, .custom-agent/) - arcle agent remove — remove an agent configuration directory - arcle agent switch — set active_agentin .ai/settings.yaml - arcle agent list— list all configured AI agents in the project - arcle agent validate— validate that all required .ai/files exist - `arcle a[...]