* feat(cli): migrate command handling to CommandManager and enhance UI interactions
* feat(cli): add /clear and /help commands to enhance user experience
* feat(cli): implement /new and /resume commands with interactive session management
* Refactor MCP and Skills Command Handling
- Moved the interactive picker style to a centralized widget for consistency across MCP and Skills commands.
- Updated the MCP command to remove the old command dispatch logic, delegating to the new InstallMCPCommand.
- Enhanced the Skills command to utilize a new interactive picker for skill selection, improving user experience.
- Implemented cancellation handling in the picker to differentiate between user cancellations and empty selections.
- Added comprehensive tests for the new command structures and picker functionalities to ensure reliability.
* refactor(cli): streamline CommandManager dispatch and remove deprecated command set
* refactor(cli): enhance error handling and state management in ChannelCommand and RichCLICommandUI
* refactor(cli): update lifecycle callback terminology and improve async prompt handling in RichCLICommandUI
* refactor(cli): enhance SlashCommandCompleter to dynamically fetch workspace directory for autocompletion
* refactor(cli): unify quit handling in RichCLICommandUI with shared _stop helper
* refactor(cli): remove hardcoded slash commands and utilize command manager for dynamic completion
* refactor(cli): update MCP and skills command files for improved clarity and organization
* refactor(mcp_ui): remove unnecessary newline in _show_mcp_config function