chore: update .gitignore to exclude io.mc file

Added io.mc to the .gitignore to prevent tracking of this file in the repository.

Author: FridrichMethod

.gitignore

@@ -233,6 +233,7 @@ __marimo__/
 *.xtc
 *.xvg
 \#*\#
+io.mc
 
 # Intermediate folders
 .claude/