# Claude code review

Artifact: `src/condensed-observables/Main.hs`

The final implementation is mathematically correct and compiles under the requested strict warning flags. Matrix adjoint and multiplication, Hermitian and positive-semidefinite predicates, density-state evaluation, spectral and finite-family sup norms, and binary clopen approximation are all correct for the stated model.

Round one identified minor opportunities to improve test discrimination and document input domains. The final source now checks a genuinely complex adjoint, exercises off-diagonal multiplication, and documents the Hermitian and finite-list preconditions. An independent round-two review found no remaining correctness or safety issues.

VERDICT: PASS