Fix changeset category prefix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: KrisBraun

.changeset/ai-preferences.md

@@ -2,4 +2,4 @@
 "@plotday/twister": minor
 ---
 
-Add AIOptions, AICapabilities types and available() method to AI tool for controlling AI feature availability in twists
+Added: AIOptions, AICapabilities types and available() method to AI tool for controlling AI feature availability in twists