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I need to return only a JSON object.\n{\n  \"winner\": \"B\",\n  \"ratio\": \"2:3\",\n  \"explanation\": \"Side B removes theme switching (cookies, dual CSS files, theme form) and introduces browse URL routing (/~/...) with ItemId.browse_href, from_browse_uri, normalize_browse_tail, 4 tests, and simplified layout/HTML serving. Side A centralizes get-base-url across 6 files, switches fly-deploy to staging branch, and fixes OAuth redirect URLs using HOSTNAME/window.location.origin. B's architectural navigation redesign and cleanup outweigh A's config 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