DEM

Detector error model + decoder exporters

3/3 passed in 0ms

Test	What it does	Result
test_check_matrix	check_matrix returns aligned H / priors / observable arrays.	✅ pass
test_graphlike_edge_two_detectors	A data-qubit error flips two stabilizers, giving a matching edge.	✅ pass
test_single_mechanism	The flip circuit yields one mechanism flipping detector 0 + observable 0.	✅ pass