openai/gpt-chat-latest → B (4:1)

Side B makes a substantial architectural change by separating path canonicalization and identity parsing into new `canonical_path.rs` and `identity.rs`, removing identity rewriting from the reducer, making delegate identities optional, and consistently enforcing stored-form usernames/agent IDs across APIs, CLI, types, and tests. Side A adds useful UI improvements (pairwise vote counts in the garden, an unpin action in the HUD, styling, and tests), but those are localized feature enhancements rather than a broad, lasting design improvement.