chore: gitignore working artifacts and large source files

.gitignore

@@ -7,9 +7,25 @@ venv/
 .envrc
 .DS_Store
 
-# Local cached renders
+# Local cached renders / runtime outputs
 out/
 cache/
+inky_today.png
+bla.png
+
+# Debug / one-off scripts
+_debug_dump.py
+
+# Working artifacts (sources we keep on disk but don't track)
+*.xcf
+
+# Picture experiments / one-offs (keep pictures/cosmicstag.png — used by renderer)
+180526_menu.jpeg
+180526_menu-inky.png
+pictures/CastleMenu*.png
+pictures/TechMeetup*.png
+pictures/Tech Meetup.*
+pictures/test-display.*
 
 # Reference clones (keep tracked source-of-truth elsewhere)
 reference/