chore: tend to allium spec to align with code

specs/sidebar_views.allium

@@ -652,6 +652,9 @@ rule ImportListClick {
 
 -- Full git interface, not the SidebarEntityList pattern.
 -- Three possible states: loading, not_a_repo, active_repo.
+-- Backend: BDS.Git provides status, diff, commit_all, history,
+-- fetch, pull, push, prune_lfs_cache, remote_state, initialize_repo.
+-- The sidebar must surface these capabilities directly.
 
 -- State: not_a_repo
 --   Remote URL text input + "Initialize Git" button.