feat: release design system engine, studio and component contracts

.gitignore

@@ -31,3 +31,11 @@ tsconfig.focus.json
 
 # Scratch modules written by tests that must resolve this workspace.
 .tmp-tests/
+
+# Isolated design release staging (built packages and browser assets)
+/.publish-design/
+/.publish-*/
+
+# Python skill caches are local build artifacts.
+__pycache__/
+*.pyc