Allow mcrun / mcdisplay to run / visualize without access to .c/.instr #3335

Job	Run time
ubuntu-24.04.clang.openmpi.python-3.12	2m 54s
windows-latest.gcc.exe.msmpi.python-3.13	3m 25s
ubuntu-24.04.gcc-13.openmpi.python-3.12	2m 47s
windows-11-arm.cl.exe.msmpi.python-3.13	2m 38s
	11m 44s

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