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Release highlights

• Opt-in instant_interrupt lets new input steer Codex during model responses or long-running code-mode calls. ( #48135 , #48141 )
• New sessions get a compact welcome screen and consistent headers, with occasional tips during and after turns. ( #48513 , #48562 , #48352 )
• The warnings viewer dismisses reviewed warnings when closed; press k to keep one for later. ( #48205 , #48206 )