openai/gpt-5.2-chat → A (9:1)

Side A makes substantive behavioral changes: it correctly passes `delegate_opt` out-of-band instead of embedding `WEB_BROWSER_AGENT` in the DSL text, prevents incorrect fallback to all items when the sibling pool is < 2 (returning `None` instead), removes the ineffective "swap sides" UI, and renames `/vote/compare` to `/vote` with routing and test updates. Side B only deletes a `notes.tdsl` file containing informal TODO notes, with no impact on runtime behavior.