cuda.core: add executable graph node updates - #2473
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Install a private CUDA user object per graph executable so later node updates can retain replacement resources safely.
Expose ephemeral graph-node views that update complete executable parameters while retaining every replacement resource CUDA may still use.
Exercise public mutators, rollback, source reclamation, independent ownership, whole updates, and in-flight cleanup end to end.
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Summary
graph[node]views for complete kernel, memcpy, memset, host-callback, child-graph, and event updates, plus executable enable state where CUDA supports it.Changes
cuGraphExecNodeSetParamswhile CUDA remains authoritative for node association.Notes
GPU tests were intentionally deferred to CI.
Related Work
Closes #2353.
Closes #2354.