Reader-defined derived variables (local BP5 path)#5133
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IO::DefineReaderDerivedVariable defines an expression on a read IO over file variables never marked derived at write time; the reader computes it on Get. Parsed at define, resolved lazily against the file on Open, and kept out of the writer-side derived registry so a write engine sharing the IO never picks it up. BP5Deserializer synthesizes a VarRec routed off the input variables' block structure (GetMetadataBase redirect), requiring congruent input shapes. Bindings for CXX, Python, C, and Fortran. Also: reader-derived vars carry no precomputed min/max, and the existing "no stored min/max" path now reports an invalid range (min>max) instead of zeroed, which was ambiguous with genuine all-zero data.
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IO::DefineReaderDerivedVariable defines an expression on a read IO over file variables; the reader computes it on Get. Parsed at define, resolved lazily against the file on Open, and kept out of the writer-side derived registry so a write engine sharing the IO never picks it up.
BP5Deserializer synthesizes a VarRec routed off the input variables' block structure (GetMetadataBase redirect), requiring congruent input shapes. Bindings for CXX, Python, C, and Fortran.
Also: reader-derived vars carry no precomputed min/max, and the existing "no stored min/max" path now reports an invalid range (min>max).