Move the Global module from packages/opencode/src/global to packages/core/src/global
to provide a unified location for managing XDG directories and application paths.
This eliminates duplicate path definitions across packages and ensures consistent
access to data, config, cache, state, log, and bin directories throughout the codebase.
Remove dynamic installation of built-in plugins. GitLab auth is now imported
directly as an internal plugin, eliminating network requests during startup
and simplifying the plugin loading logic.
Removes the need for test mocks since plugins are no longer
dynamically installed at runtime.
Kit Langton