docs/assets/demo_bias.png is generated by tools/make_readme_chart.py with a white background. GitHub supports theme-aware images via the <picture> element with prefers-color-scheme. Task: emit a demo_bias_dark.png from the same script (dark background, adjusted colors) and switch the README to the <picture> form. The chart must keep being regenerated from run_demo — no hand-drawn numbers.
docs/assets/demo_bias.pngis generated bytools/make_readme_chart.pywith a white background. GitHub supports theme-aware images via the<picture>element withprefers-color-scheme. Task: emit ademo_bias_dark.pngfrom the same script (dark background, adjusted colors) and switch the README to the<picture>form. The chart must keep being regenerated fromrun_demo— no hand-drawn numbers.