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Closes the roadmap's long-standing "no eval-latency number exists for any configuration" gap. Instruments `giant rollout` to record per-physical-step wall-clock cost in its YAML sidecar, adds a measured Geant4/miniCaloSim per-step reference (giant/analysis/geant4_reference.py, from a 3-energy, 4-event-count-per-energy local benchmark), and wires both into a new eval_cost_per_step PlotSpec in the giant analyze gallery. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>