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The v0.3.0 pivot exists because the 2026-08-03 WGAN rollout benchmark produced zero photon secondaries and ~4M hallucinated antineutrinos — even with a correctly-sized top-N species vocabulary (gitea #29), plain cross-entropy over a class distribution spanning orders of magnitude still under-predicts rare-but-physical species. stage2_model.particle_type.class_weighting = "none" | "inverse_freq" (default "none", fully back-compat) weights the stage-2 type head's CE loss (FlowDDPMStageTrainer._type_loss) by inverse class frequency, normalized to mean 1 so switching it on doesn't rescale the type loss against particle_type.lambda / the generator loss it's summed with. The per-class counts the weighting needs don't already exist despite the issue's premise: _topn_plus_other_map (giant/data/loader.py) previously kept counts only for keys folded into "other", dropping the kept classes' counts on the floor. TopNMap now carries class_counts (index -> count), round-tripped through the setup-cache sidecar (format version bumped 3->4, since existing sidecars have none) and through checkpoints (tolerantly — a pre-#44 checkpoint decodes to {}, since only training-time loss weighting reads it, not inference). Decisions made during planning (with the user): dropped "effective_num" from the issue's proposed three-way enum (no beta hyperparameter to design around) — final domain is "none" | "inverse_freq". Weights are mean-1-normalized. validate_config rejects class_weighting != "none" combined with particle_type.target != "onehot" or stage2_model.generator == "wgan" (both have no class CE to weight), following the #28/#30 dead-key-must-not-go-silent convention. Branch fix/issue-44 off master. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>