Upload retrained V9-Pure final model weights with LFS tracking

Update README with V8-Fixed results

V8-Fixed best weights: s1600, easy100 NED=0.7760, easy50 NED=0.8257

V5 f32: replace collapsed old model with diverse V5

V5: LLM-only LoRA r=8, frozen projector, 90% diversity (no collapse)

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