v1.5b: MIXES preset-aware (350m EN47/TR30 tc100b/code13/math10) + ShardStream mix param

faz3_train: fix print satiri args.n_layers->cfg[n_layers] (preset ile None oluyordu)

faz3_train: --preset 350m (cfg parametrize; 177m=177.1M v1-birebir, 350m=348.6M dogrulandi); --attn_every/--d_model vb override

faz3_train: Muon optimizer entegrasyonu (--muon: 2D-Linear Muon + embed/norm AdamW; cklu-opt state + WSD-carpan; geriye uyumlu)

Faz 3 trainer (fork hibrit + WSD + resumable ckpt/HF push); arrow-col + resume fix

Faz 3 tam trainer