~x-ai/grok-latest → B (2:5)

B fixes real Reddit import behavior by replacing incomplete link_child/ensure_path wiring with apply_entity_under_parent so listing children attach under the subreddit without comment-path segments, and makes unranked labels use entity titles via child_label/ranking_panel(tree). A only tightens vote-ratio validation (reject 0-sides and >100) across parser/UI/reducer with regression tests—useful invariants, but less product-critical than the import and display fix.