Fix SSL certificate issue when downloading Essentia models

Use curl -k flag to bypass SSL verification for essentia.upf.edu
Add file size check to ensure models are downloaded correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/download-essentia-models.sh

@@ -24,12 +24,14 @@ download_model() {
         echo "✓ $model_file already exists, skipping..."
     else
         echo "⬇️  Downloading $model_file..."
-        curl -L -o "$output_path" "$url"
+        # Use -k flag to ignore SSL certificate issues with essentia.upf.edu
+        curl -k -L -o "$output_path" "$url"
 
-        if [ -f "$output_path" ]; then
-            echo "✓ Downloaded $model_file"
+        if [ -f "$output_path" ] && [ -s "$output_path" ]; then
+            echo "✓ Downloaded $model_file ($(du -h "$output_path" | cut -f1))"
         else
             echo "✗ Failed to download $model_file"
+            rm -f "$output_path"  # Remove empty/failed file
             exit 1
         fi
     fi