GCFT-0442: The Gamma Skeleton

GCFT-0442 enumerates the symbolic anomalous-dimension support for the SM-G02 BF/Xi branch over the retained eleven-entry BRST-compatible operator basis frozen in GCFT-0441. The paper constructs the topology of the gamma-matrix skeleton, records which operator-mixing channels are symbolically admissible, and seals the channels that remain forbidden by the phase-blind coherence-kernel and retained-order power-counting contracts. It does not compute numerical anomalous-dimension coefficients, does not execute finite broken-phase matching, does not test scale stability, and does not emit or compare endpoint observables. The result is therefore a renormalization-structure gate: symbolic access is organized, while precision promotion remains explicitly open.