ImpairmentsDomain

The phase-walk pair's argument domain

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Test	What it does	Result
test_walk_consumers	impairments.dephasing and a q.Link declaring a negative q.Dephasing refuse in the same words on both the closed-form and the sampled path.	✅ pass
test_walk_slots	phase_variance and coherence refuse a negative linewidth or delay by argument name, coherence stays at or below 1, and zero on either slot returns 1.0.	✅ pass