Add AI-generated prototype disclaimer

Author: ceddc

README.md

@@ -4,6 +4,10 @@
   <img src="./public/assets/globby-base.png" alt="Globby, the Tiny Assistant character" width="112" />
 </p>
 
+_Disclaimer: this code was 100% generated by AI. It may be good, it may be bad,
+but it works. It achieved the prototype goal I had: checking whether something
+like this could be useful._
+
 Tiny Assistant is a weekend AI experiment about making something like Clippy
 for ArcGIS: a tiny movable assistant character for an ArcGIS web map.