RelayInterference

Two-source interference: mode overlap, HOM ceiling, error from contrast

3/3 passed in 3ms

Test	What it does	Result
test_error_monotone	relay_error rises as the mode match falls, reads (1 - contrast)/2 in the weak-flux limit with no fitted constant, and is floored by dark counts.	✅ pass
test_hom_orders	The phase-averaged dip from relay_ports equals hom_visibility at intensity overlap = contrast^2, to 1e-7.	✅ pass
test_overlap_width	mode_overlap falls with width mismatch and offset, is symmetric in the widths and even in the offset, and reads 0.8 at a 2:1 ratio.	✅ pass