Add persistent program cache for Program.compile#1912

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cpcloud wants to merge 34 commits intoNVIDIA:mainfrom

cpcloud:persistent-program-cache-178

Commits on May 6, 2026

feat(core.utils): persistent program cache
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feat(core): Program.compile(cache=...) convenience wrapper
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refactor(core.utils): import program cache eagerly, fix ruff findings
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docs(core): nest Program caches under CUDA compilation toolchain
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docs(core.utils): nudge cache callers toward close()
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docs(core.utils): teach cache examples with public ObjectCode API
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feat(core): require Program.compile(cache=...) to be a ProgramCacheResource
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test(core): mock driver_version to keep _can_load_generated_ptx as cpdef
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docs(core): note cache hits do not write to logs
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fix(core.utils): cache _LinkerBackend driver decision per key call
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fix(core): lowercase target_type in Program.compile and cache key
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refactor(core.utils): collapse _LINKER_RELEVANT_FIELDS into _LINKER_FIELD_GATES
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fix(core.utils): contextual error when path-backed ObjectCode vanishes
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docs(core): clarify cache= vs ProgramOptions.no_cache independence
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test(core.utils): tighten multiprocess cache assertions
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test(core.utils): add InMemoryProgramCache thread test and FileStream overwrite test
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refactor(core.utils): drop dead empty-key branch in _path_for_key
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perf(core.utils): drop redundant stat in FileStreamProgramCache.__len__
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feat(core.utils): reject max_size_bytes=0 in cache backends
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docs(core.utils): note ptxas_options order is intentionally significant
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docs(core.utils): document the _keys.py <-> _program.pyx import contract
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docs(core.utils): note options.name double-hash on PTX is intentional
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docs(core.utils): document burst-write over-eviction trade-off
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docs(core): explain why Program.compile cache decode is provably safe
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refactor(core.utils): extract _stat_key for the four stat-guarded paths
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refactor(core.utils): collapse Windows sharing-retry loops
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fix(test): walk sharded entries dir in FileStream overwrite assertion
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fix(test): collapse nested with into a single contextmanager group (SIM117)
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fix(core.utils): keep path-backed ObjectCode error message Windows-friendly
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perf(core.utils): track FileStream cache size incrementally
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test(core.utils): drop SUPPORTED_TARGETS cross-check
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refactor(core.utils): idiomatic with-as on os.scandir, yield from inner
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refactor(core.utils): extract _iter_tmp_entries and _sum_tmp_sizes
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fix(core.utils): clamp tracked size at zero on __delitem__
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