Add organ logo to README

Adds the AI-generated organ logo (downscaled to 400px) at the top of the
README.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 2 people

README.md

@@ -1,3 +1,7 @@
+<p align="center">
+  <img src="logo.png" alt="PyAutoConf" width="400">
+</p>
+
 # PyAutoConf
 
 🧬 **PyAutoScientist → <https://github.com/PyAutoLabs/PyAutoScientist>** — this repo is one organ of the PyAuto organism.