Credit qwen3.8-flash-next-iq3xxs with Strata in OpenCode, with pixel marks

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

CREDITS.md

@@ -8,5 +8,8 @@
 ## Made with Claude Code
 The game was developed with the help of [Claude Code](https://claude.com/claude-code), Anthropic's AI coding assistant. The small pixel-art mark next to the note on the title and login screens is a rendition of the Claude Code logo. Claude, Claude Code and Anthropic are trademarks of Anthropic; the mark only credits the tool and is not covered by the MIT licence of this project.
 
+## Made with qwen3.8-flash-next-iq3xxs, Strata and OpenCode
+Parts of the game were also developed with the language model qwen3.8-flash-next-iq3xxs, run with Strata in [OpenCode](https://opencode.ai). The two small pixel-art marks next to the second note on the title and login screens are renditions of the Qwen and the OpenCode logo. Qwen and OpenCode are trademarks of their respective owners; the marks only credit the tools and are not covered by the MIT licence of this project.
+
 ## Everything else
 Code, procedural graphics and game design: the DungeonCraft project.