I realized the grandparent was not quite on target, and so edited in a more relevant bit.

You mean physical maybe-constants like the FSC should go into the map as nodes, but the rest of physics shouldn't?

I think that having laws physics in as nodes could work- with those nodes then pointing to basically every physical node. Another way to view it would be the laws of physics as a program you could use to generate causal graphs, or as a set of checks that a causal graph must pass to be considered 'reasonable.' The latter view is probably closer to how humans behave, but I haven't thought about it enough to endorse it.