fix: restore parse_model_output exception parity with original bare except

chore: align train_grpo.ipynb with smoke/syntax patterns for Colab

add train_grpo_smoke notebook; quote pip versions in train_grpo

fix: notebook loads Qwen without bitsandbytes on Mac; optional training deps

fix: robust notebook setup (no magic shell) + local CWD auto-detect

update

fix: rewrite training notebook for real LoRA fine-tuning on Colab

la la la --123

firstiteration