[Core][KV] Retain prefix-cache across hybrid SWA+Full via is_pinned blocks#40676

jhaotingc wants to merge 4 commits into

vllm-project:mainvllm-project/vllm:mainfrom

jhaotingc:jhaotingc/gemma-4-swa-flush-OOW-firstjhaotingc/vllm:jhaotingc/gemma-4-swa-flush-OOW-firstCopy head branch name to clipboard