openai/gpt-5.3-chat → B (5:1)

Commit B introduces a substantial architectural change: async settlement worker, batched vote processing, ranking cache, API adjustments, and removal of demo-only features. It improves performance, concurrency, and system design across multiple modules. Commit A is valuable but सीमित to fixing test mocks and OAuth flow bugs; it’s primarily a correctness and reliability fix rather than a structural improvement.