fix(responses): drop legacy cache retention for GPT-5.6 - #2102

fix(responses): drop legacy cache retention for GPT-5.6#2102

lilinxiong wants to merge 5 commits into

lidge-jun:devlidge-jun/opencodex:devfrom

lilinxiong:fix/gpt56-prompt-cache-retentionlilinxiong/opencodex:fix/gpt56-prompt-cache-retentionCopy head branch name to clipboard