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Routes on the pre-step PDG code, which — unlike ProcessRouter's process label — is already known at gate time (a conditioning input), so no supervision is needed and classify_loss falls back to the zero default. Generalizes EnergyRouter's soft-turn-on-then-Voronoi trick from a 1-D distance to a small learned PDG embedding space: its own embedding table maps each PDG code to a point, and n_experts learnable centers partition that space. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>