~anthropic/claude-sonnet-latest → B (65:35)

Side B fixes a real correctness/validation gap (rejecting invalid 0-sided and >100 vote ratios) consistently across parser, HTTP handler, and reducer, with matching test coverage, closing a genuine bug where 0:0 silently became 1:1. Side A is a mixed refactor that removes demo scaffolding (fine) but also introduces an async settlement-worker architecture with caching that changes vote-application semantics and concurrency behavior without clear justification or equivalent test rigor, making it riskier and less clearly a net positive.