DemDecoder

Detector error model and decoders

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Test	What it does	Result
test_batch_matches_rows	Decoding a batch, with its syndromes deduplicated and memoised, matches decoding each shot alone.	✅ pass
test_check_detectors_and_twirl	check_detectors refuses a random observable only when asked to check observables, and twirl leaves only Pauli noise on the same record layout.	✅ pass
test_make_dispatch	make() builds the right decoder for each name and target, threads max_bond to "tn" and "coherent" only, refuses bad requests with ValueError, and decodes the Pauli twirl of non-Pauli noise only when asked, always warning.	✅ pass
test_matches_full_sweep_oracle	The detector error model matches a brute-force full-sweep oracle mechanism for mechanism, across families with measurements before and after the noise.	✅ pass
test_reuse_for	A BP-OSD decoder re-pointed at the next rate's DEM decodes like a fresh one, and refuses a DEM with a different check matrix.	✅ pass