openai/gpt-chat-latest → A (3:2)

Side A introduces a substantial architectural separation by moving path normalization into `canonical_path.rs` and identity parsing into `identity.rs`, removes identity rewriting from the reducer, enforces strict stored-form usernames/agent IDs across APIs, and makes delegate handling optional, with corresponding updates throughout server, CLI, types, and tests. Side B improves performance and design by removing the demo counter, adding a settlement worker with cached ranking computation (`settlement.rs` and `ranked_items_cached`), but its scope is narrower than A's project-wide normalization and API consistency changes.