Link the JouleBeat site and project brief from the README

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: Protocol-zero-0

README.md

@@ -478,3 +478,7 @@ evidence/                checked-in artifacts of runs anyone can reproduce
 ## License
 
 MIT — see [LICENSE](LICENSE).
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+Evolution Kernel is a [JouleBeat](https://joulebeat.com/) project — landing page at [evolution-kernel.joulebeat.com](https://evolution-kernel.joulebeat.com/), project brief at [joulebeat.com/projects/evolution-kernel](https://joulebeat.com/projects/evolution-kernel/).