openai/gpt-chat-latest → A (4:1)

Side A introduces a lasting architectural separation by extracting path normalization into `canonical_path.rs` and identity parsing into `identity.rs`, removes identity rewriting from the reducer, standardizes stored/wire identities without `@`, makes delegate identities optional, and updates APIs, HTML, CLI, and tests to consistently enforce those semantics. Side B fixes a real reducer bug by moving the zero-ratio early return before `ensure_item` and `voted_pairs.insert`, preventing ghost items and false voted pairs, but it is a narrowly scoped correctness fix compared with Side A's broader, durable redesign.