openai/gpt-chat-latest → A (3:1)

Side A makes a behavioral code change by removing a redundant early return in `GroupState::apply_vote`, allowing items and voted pairs to be registered even when clamped ratios become zero while still relying on `add_edge_weight` to skip zero-weight edges. It also updates the test to verify the new, more consistent reducer behavior. Side B is an extensive documentation update aligning guides and plans with the current identity model, but it does not change project behavior.