Add program caches (in-memory, sqlite, filestream)#1912

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cpcloud wants to merge 6 commits intoNVIDIA:mainfrom

cpcloud:persistent-program-cache-178

Commits on Apr 22, 2026

feat(core.utils): add persistent program caches (sqlite + filestream)
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fixup! feat(core.utils): couple key schema with backend schema; document pickle compat; add usage example
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fixup! feat(core.utils): ruff format the added docstring example
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fixup! feat(core.utils): derive __all__ from _LAZY_CACHE_ATTRS; document star-import caveat
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fixup! feat(core.utils): address review findings on cache key and eviction
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feat(core.utils): add InMemoryProgramCache backend (#177)
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