refactor: Keep Samples visible in dev, rename to Samples~ on deploy

- Samples folder now visible and editable in Unity during development
- Workflow automatically renames Samples -> Samples~ during UPM deploy
- Proper structure: Samples/CasperWalletDemo/

Author: SamuelGuizani

.github/workflows/publish-upm.yml

@@ -34,15 +34,19 @@ jobs:
                   # Create temp directory
                   mkdir -p /tmp/upm-package
 
-                  # Copy package contents (excluding Tests and orphan meta files)
+                  # Copy package contents
                   cp -r Assets/CasperSDK/* /tmp/upm-package/
 
                   # Remove Tests folder (not needed in production package)
                   rm -rf /tmp/upm-package/Tests
                   rm -f /tmp/upm-package/Tests.meta
 
-                  # Remove orphan Samples.meta (folder is Samples~, not Samples)
-                  rm -f /tmp/upm-package/Samples.meta
+                  # Rename Samples to Samples~ for UPM convention
+                  # (hides samples from auto-import, makes them optional via Package Manager)
+                  if [ -d "/tmp/upm-package/Samples" ]; then
+                      mv /tmp/upm-package/Samples /tmp/upm-package/Samples~
+                      rm -f /tmp/upm-package/Samples.meta
+                  fi
 
                   # Initialize git in package folder
                   cd /tmp/upm-package