feat: reliable multi-source model delivery system

- Implements automatic fallback chain: CDN → GitHub → Hugging Face
- Adds Soulcraft CDN as primary model source (models.soulcraft.com)
- GitHub release tar.gz extraction as reliable backup
- Zero configuration required - fully automatic
- Guarantees same model (all-MiniLM-L6-v2) across all sources
- 384-dimensional embeddings for data compatibility
- Local caching after first download
- Production-ready with multiple redundancy layers

BREAKING CHANGE: Removed tar-stream dependency, now uses native tar command

scripts/create-models-release.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+# Create GitHub release with unarchived model files for direct serving
+# This allows transformers.js to download individual files directly
+
+set -e
+
+echo "🚀 Creating GitHub release with unarchived model files..."
+
+# Create temporary directory
+TEMP_DIR=$(mktemp -d)
+cd "$TEMP_DIR"
+
+echo "📥 Downloading existing model archive..."
+curl -sL https://github.com/soulcraftlabs/brainy/releases/download/models-v1/all-MiniLM-L6-v2.tar.gz -o models.tar.gz
+
+echo "📦 Extracting models..."
+tar -xzf models.tar.gz
+
+echo "🔧 Preparing individual model files for release..."
+
+# Create properly structured directory
+mkdir -p release-files/Xenova/all-MiniLM-L6-v2/onnx
+
+# Copy files with correct naming for direct serving
+cp all-MiniLM-L6-v2/config.json release-files/Xenova/all-MiniLM-L6-v2/
+cp all-MiniLM-L6-v2/tokenizer.json release-files/Xenova/all-MiniLM-L6-v2/
+cp all-MiniLM-L6-v2/tokenizer_config.json release-files/Xenova/all-MiniLM-L6-v2/
+cp all-MiniLM-L6-v2/onnx/model.onnx release-files/Xenova/all-MiniLM-L6-v2/onnx/
+
+# Also keep the tar.gz for backward compatibility
+cp models.tar.gz release-files/
+
+echo "📋 Files to upload:"
+find release-files -type f -exec ls -lh {} \;
+
+echo ""
+echo "✅ Files ready for release!"
+echo ""
+echo "To create the release with individual files:"
+echo ""
+echo "1. Go to: https://github.com/soulcraftlabs/brainy/releases/new"
+echo "2. Tag: models-v2"
+echo "3. Title: Model Files v2 - Unarchived"
+echo "4. Upload these files from $TEMP_DIR/release-files/:"
+echo "   - Xenova/all-MiniLM-L6-v2/config.json"
+echo "   - Xenova/all-MiniLM-L6-v2/tokenizer.json"
+echo "   - Xenova/all-MiniLM-L6-v2/tokenizer_config.json"
+echo "   - Xenova/all-MiniLM-L6-v2/onnx/model.onnx"
+echo "   - all-MiniLM-L6-v2.tar.gz (for compatibility)"
+echo ""
+echo "Or use GitHub CLI:"
+echo "  cd $TEMP_DIR/release-files"
+echo "  gh release create models-v2 --repo soulcraftlabs/brainy \\"
+echo "    --title 'Model Files v2 - Direct Serving' \\"
+echo "    --notes 'Unarchived model files for direct HTTP serving' \\"
+echo "    Xenova/all-MiniLM-L6-v2/config.json \\"
+echo "    Xenova/all-MiniLM-L6-v2/tokenizer.json \\"
+echo "    Xenova/all-MiniLM-L6-v2/tokenizer_config.json \\"
+echo "    Xenova/all-MiniLM-L6-v2/onnx/model.onnx \\"
+echo "    models.tar.gz"