Add PersistentProgramCache (sqlite + filestream backends)#1912

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cpcloud wants to merge 7 commits intoNVIDIA:mainfrom

cpcloud:persistent-program-cache-178

Commits on Apr 19, 2026

feat(core.utils): add persistent program caches (sqlite + filestream)
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fixup! feat(core.utils): run subprocess from neutral cwd to avoid source-tree shadow
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fixup! test(core.utils): rewriter does one final uncontested write to avoid scheduler-race flake
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fixup! feat(core.utils): retry os.replace on Windows ERROR_ACCESS_DENIED (winerror 5)
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fixup! feat(core.utils): retry read on Windows sharing PermissionError; ensure threads exit before cache close
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fixup! feat(core.utils): also retry read on Windows EACCES (errno 13)
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fixup! test(core.utils): suppress PermissionError on reader's corrupt-write (Windows sharing race)
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