fix: Preserve RuntimeError messages in localizedDescription - #1657
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Calling
error.localizedDescriptionon a caughtRuntimeErrorcurrently returns Foundation's generic "The operation couldn’t be completed" message instead of the stored error message.Make
RuntimeErrorconform toLocalizedErrorand return its existingdescriptionfromerrorDescription. This preserves the message throughErrorandNSErrorwithout changing logging call sites or C++ error conversion.Validated by compiling the actual Swift source and C++ exception helpers and running smoke checks for
Error.localizedDescription,NSError.localizedDescription, catch blocks, string descriptions, and C++ round-trips, including empty and Unicode messages.git diff --checkpasses.