chore: Add docs/archive/ to .gitignore

Archive directories contain development notes and duplicate files that don't need to be tracked in git.

Author: JOHN

.gitignore

@@ -36,3 +36,6 @@ Thumbs.db
 # Temporary files
 *.tmp
 .cache/
+
+# Archive directories (development notes, duplicates, etc.)
+docs/archive/