openai/gpt-chat-latest → B (3:2)

Side B hardens core authentication behavior by making vote attribution fail closed instead of silently falling back to an anonymous actor, adding Secure cookie handling based on HTTPS, tightening return URL validation against open redirects, and gating mock OAuth behind an explicit environment flag, with accompanying tests. Side A provides a valuable Reddit integration fix by requiring OAuth when configured, retrying after 401/403 with token refresh, and improving error handling, but its impact is narrower than the broader security and authentication improvements in Side B.