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Nontrivial six-qubit stabilizer code

A fixed non-CSS stabilizer block in which every physical qubit participates in the primary paper's entangled representative. One stabilizer has lower weight than the code distance, making degeneracy visible directly in the executable presentation. This is the nontrivial equivalence class, not the five-qubit code with an unused ancilla and not a holographic network built from a six-leg encoding tensor.