llm, AGENTS.md, cover downgrades not being preferred.

tasks/workstation/linux/software/ai/llm.yml

@@ -648,6 +648,10 @@
               These are the versions of plugins and languages we need to use.
               If you know of an important upgrade from them, please let me know.
 
+              If you find that an application is already a newer version than
+              those listed here, that is acceptable, never attempt to downgrade
+              without explicitly asking the user first and having a good reason.
+
               ## Android / Flutter
 
               - Gradle 9.8.2