feat: upload eval/arm_gym_grpo_colab.ipynb

fix(plots): upload eval/plots/before_after_kernel.png

fix(plots): upload eval/plots/training_loss.png

fix(plots): upload eval/plots/correctness_rate.png

fix(plots): upload eval/plots/reward_curve.png

fix(reset): copy gcc-cross headers in Dockerfile, add proper error handling to reset/step

fix(ui): rewrite why-cards, metric strip, hero sub, remove em dashes from captions

fix(hero): remove tag pills from hero section

feat(readme+blog): narrative rewrite, em dash cleanup, remove hero badge

fix(space): vertically center figcaption text in plot cards

fix(ui): plots uncropped — object-fit:contain, height:auto, no forced aspect-ratio

feat(ui): V11 frontend — real plots, updated metrics/diagram, model links

feat(notebook): storytelling layer — origin story, research lineage, honest speedup framing, future vision

feat: add arm_gym_grpo_colab.ipynb — V11 primary, V10 comparison, 5 plots pre-embedded