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I need to return only a JSON object.\n{\"winner\": \"B\", \"ratio\": \"3:2\", \"explanation\": \"Side B adds GitHub OAuth, session management, pseudonym claims, and identity events (principal creation, oauth linking, pseudonym claiming) plus vote gating - foundational product capability for accountability and multi-user voting.","reasoning_details":[{"type":"reasoning.summary","summary":"The user wants me to compare two commits and decide which contributed more lasting value to the project. 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