TruncatedWitness

Phase 5c API: Wigner negativity and non-Gaussianity, and what separates them

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Test	What it does	Result
test_witness_truncation	Exactly Gaussian states (true score zero) post 2.28 bits of S(shadow) - S(rho) at the default cutoff and under 1e-3 at cutoff 160, as a Divergence carrying the truncation error.	✅ pass