openai/gpt-chat-latest → A (4:1)

Side A changes the sibling navigation behavior so each unranked sibling becomes its own navigation group instead of all unranked siblings being merged together, matching the documented ranking model, and adds a focused regression test verifying the new grouping. Side B is primarily a structural refactor that moves forum code into new modules and inlines a few helper calls, plus adds a macOS profiling utility; while useful for maintainability, it introduces little new project behavior compared with A's concrete, tested functional improvement.