BudgetPlanes

The four named planes and the algebra of referring a noise between them

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Test	What it does	Result
test_plane_compose	Referring through an intermediate plane equals referring straight there, and at(plane) is refer() row by row.	✅ pass
test_plane_detector	post_detection is the one plane needing eta, one factor of it past detector_input.	✅ pass
test_plane_names	The four planes in optical order, "input" and "bob" aliasing the channel and detector inputs, with referral factors 1, launchspan, T, Teta.	✅ pass