- Remove --project-path from plugin-install/list/uninstall (use cwd like npm)
- Split --name key@version into separate --name and --version flags
- Remove pluginParseInstallTarget (no longer needed)
- Improve DryRun desc and error hints for --version usage
- Update skill docs to reflect new flag structure
- Tests use chdirTest helper instead of --project-path
Add pluginCheckDependentInstances to scan capabilities/ for instances
that reference the plugin being uninstalled. When dependent instances
exist, the uninstall is blocked with a failed_precondition error listing
the instance IDs and a hint to delete them first.