Migrate all deep import paths across source and test files to
reference barrel index modules instead of direct file paths. This
covers config, provider, storage, util, tool, lsp, project, and
installation modules. Also moves provider promise helpers out of the
namespace block, switches Clipboard to namespace import style, fixes a
duplicate Filesystem import, removes the deleted paste-summary test,
and corrects snapshot cache typing and indentation.
Imanol Maiztegui
251ed67347