[FEA] Recsys/HSTU KVCache interface refactoring#370

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Clebrate wants to merge 7 commits intoNVIDIA:mainfrom

Clebrate:lyl-Flexkv-integration

Commits on Apr 17, 2026

Commits on Apr 20, 2026

Phase(1): align HSTU KVCache manager with showcase script
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Commits on Apr 22, 2026

Phase2-1: add FlexKV secondary call skeleton and backend coverage
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Commits on Apr 23, 2026

fix(Phase2-1): align FlexKV storage manager and adapter responsibilities
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Commits on Apr 27, 2026

feat(phase2-1): Integrate real FlexKV lifecycle for HSTU KV cache path.
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