openai/gpt-chat-latest → B (3:1)

Side B fixes a correctness bug by moving the zero-ratio early return before any side effects, preventing ghost items from being indexed and voted pairs from being recorded incorrectly. The accompanying test is updated to verify that no items, edges, or voted pairs are registered, whereas Side A is primarily a tooling enhancement (faster scan mode, richer parse errors, and new CLI functionality) rather than a core state-correctness fix.