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First, from the point of view of the Sage library: the directories in SAGE_ROOT/src/sage are mostly pretty broad — groups, graphs, rings, etc. — and it sounds to me like foams is too narrow. If it is an extension of SimplicialComplex, the files could go in src/sage/topology or in a subdirectory of this, or conceivably in a subdirectory of some other main directory.

Second, you can certainly submit a pull request, but it's probably also a good idea to post to the sage-devel Google group to alert people that you've done this, to advertise your work, and to ask for feedback and reviews. No need to start a stream on zulip.