Credit Claude Code: note at the top of the README, in CREDITS and the standalone file; pixel-art mark with link next to the licence on title and login screens

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/en.lang

@@ -552,6 +552,7 @@ unit.owl = Arcane Owl
 unit.wyrm = Ember Wyrm
 job.rest = Recovering in the aerie
 job.torment = Working on a prisoner
+menu.made_with = Made with the help of Claude Code
 menu.license = DungeonCraft - MIT License - (c) 2026 Richard Zink
 
 # steel walls