Ignore local .notes/ directory

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: EtherealCarnivore

.gitignore

@@ -37,3 +37,6 @@ src/Data/TimelessJewelData/*.bin
 # Simplegraphic Debugging
 runtime/imgui.ini
 runtime/SimpleGraphic/SimpleGraphic.log
+
+# Local-only documentation notes (never commit upstream)
+.notes/