package:skills v1.0.0-beta.1

• feat: Added a dialog to select which packages to install skills from during
  skills get and skills remove.
• feat: Added a dialog to select which specific skills to install during
  skills get and skills remove.
• Breaking Change: Removed support for rest arguments, instead use the new
  --package, --skill, --git or --all options, or the built in dialogs.
• Breaking Change: getSkills now takes a set of source uris to install
  instead of just a single package name. To install all skills pass the
  allFlag: true argument. Packages should be provided in package:<name>
  format instead of just by name.
• refactor: Migrate from .agent/skills to .agents/skills for the generic agent
  adapter. When a .agent/ dir is detected you will be prompted for what action
  to take.
• feat: Added DialogSupport interface and optional parameter to getSkills,
  includes a CliUtilDialogSupport implementation for use in simple CLIs.
• feat: Breaking Change - Removed stdout and stdin parameters to
  getSkills and replaced them with a required Logger logger.
• feat: Check packages for security advisories on install.
• chore: Move cache dir to .dart_tool/skills from .dart_skills.
• feat: Allow the user to select an agent if none is detected.
• fix: Breaking Change - Only install skills from immediate dependencies.
• chore: Breaking Change - Drop support for the built in "registry" concept.
• feat: Add a general install from git concept, through the new add command,
  which maps very closely to how npx skills add works.
  • Many commands from https://skills.sh will now work, by simply substituting
    npx skills for dart run skills@.
  • The get command now supports --git arguments for git repos to update
    skills from.
• feat: Once per machine/project, suggest installing the dart and flutter
  skill repos, if they are not already installed.
• feat: Support internal: true metadata in frontmatter to skill internal
  skills, unless the INSTALL_INTERNAL_SKILLS=1 environment variable is set.
• chore: Rename --ide option to --agent option, --ide will still work
  as an alias for some time.
• chore: Breaking Change: Renamed IDE enum to Agent.