openai/gpt-chat-latest → A (9:1)

Side A adds substantial new functionality and infrastructure: an extensible external URL foundation with GitHub resolution, on-demand system ingests (`WriteCmd::SystemIngest`), URL normalization changes, resolver cooldown state, UI actions for external resolution, external preview handling, and accompanying parser and browser tests. Side B is a focused improvement that switches vote links to use `display_path` instead of storage URLs and strengthens the vote-pool browser test by exercising all 45 pairings and asserting the resulting ranking, but it does not introduce comparable lasting capabilities.