openai/gpt-chat-latest → A (4:1)

Side A introduces a substantial architectural refactor by separating path normalization into `canonical_path.rs` and identity parsing into `identity.rs`, removing identity rewriting from the reducer, making delegate identities optional, and consistently enforcing stored-form usernames/agent IDs across APIs with validation. Side B adds a useful Reddit background fetch worker with OAuth, rate limiting, and lazy fetch triggering, but it is a narrower feature addition compared with A's broad cleanup of identity semantics and API/storage invariants that affects core project design.