Add skills:install command

[joetannenbaum]

Add skills:install command and document remote access in SKILL.md

• New skills:install command that fetches agent skills from laravel/agent-skills on GitHub and installs them to the appropriate directories for each coding agent (Claude, Cursor, Junie, GitHub Copilot, etc.)
• Supports --global / --project scope, --agent for explicit agent selection, and --force to overwrite
• Auto-detects which agents are installed based on existing directories; in interactive mode, presents a multiselect pre-populated with detected agents
• Fix SuppressOutputIfJson middleware to recognize -n shorthand and suppress output for NoAuthRequired commands
• Add tinker and command:run documentation to the deploying-laravel-cloud skill