docs(readme): restore live star history alongside the stars badge (#734)

I restored the historical curve below the GitHub stars badge, keeping
both. The chart uses Star History's current /chart endpoint with light
and dark variants.

Star History adopted GitHub's dedicated history API in September:
https://www.star-history.com/blog/new-github-star-history-api. This
replaces the delayed SimRepo history previously used in the README.

I checked all 48 weeks returned by GitHub for CodeNomad: they total
2,581 stars and include recent September activity. Both chart variants
return valid SVGs. I also rendered the README section in Chromium and
inspected light/dark captures showing both the badge and the curve. git
diff --check passed.

Follow-up to #732.
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Pascal André 2026-09-21 00:07:08 +02:00 • committed by GitHub
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@ -185,6 +185,14 @@ See full workaround in the original README.
[![GitHub stars](https://img.shields.io/github/stars/NeuralNomadsAI/CodeNomad?style=flat-square&label=GitHub%20stars)](https://github.com/NeuralNomadsAI/CodeNomad/stargazers)
<a href="https://www.star-history.com/?repos=NeuralNomadsAI%2FCodeNomad&amp;type=date">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/chart?repos=NeuralNomadsAI/CodeNomad&amp;type=date&amp;theme=dark" />
<source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/chart?repos=NeuralNomadsAI/CodeNomad&amp;type=date" />
<img alt="CodeNomad star history" src="https://api.star-history.com/chart?repos=NeuralNomadsAI/CodeNomad&amp;type=date" />
</picture>
</a>
---
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