feat: implement clean embedding architecture with Q8/FP32 precision control

- Unified embedding system with single EmbeddingManager
- Q8 model support with 75% smaller footprint (23MB vs 90MB)
- Intelligent precision auto-selection based on environment
- Clean cached embeddings with TTL and memory management
- Zero-config setup with smart defaults
- Complete storage structure documentation
- Removed legacy worker and hybrid managers
- Streamlined model configuration and precision management

use-node-22.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# Brainy Node.js Environment Setup
+# Ensures Node.js 22.x LTS is used for all operations
+
+echo "🚀 Setting up Brainy environment with Node.js 22.x..."
+
+# Load NVM
+export NVM_DIR="$HOME/.nvm"
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+
+# Check if nvm is available
+if ! command -v nvm &> /dev/null; then
+    echo "❌ NVM is not installed. Please install NVM first."
+    echo "Visit: https://github.com/nvm-sh/nvm#installing-and-updating"
+    exit 1
+fi
+
+# Use Node 22 (reads from .nvmrc)
+echo "📦 Switching to Node.js 22..."
+nvm use 22
+
+# Verify versions
+NODE_VERSION=$(node --version)
+NPM_VERSION=$(npm --version)
+
+echo "✅ Environment ready!"
+echo "   Node.js: $NODE_VERSION"
+echo "   npm: $NPM_VERSION"
+
+# Check if versions are correct
+if [[ ! "$NODE_VERSION" =~ ^v22\. ]]; then
+    echo "⚠️  Warning: Not using Node.js 22.x"
+    echo "   Installing Node.js 22 LTS..."
+    nvm install 22
+    nvm use 22
+    NODE_VERSION=$(node --version)
+    NPM_VERSION=$(npm --version)
+    echo "✅ Installed Node.js $NODE_VERSION with npm $NPM_VERSION"
+fi
+
+# Export for child processes
+export NODE_VERSION
+export NPM_VERSION
+
+# Run any command passed to this script
+if [ $# -gt 0 ]; then
+    echo "🎯 Running: $@"
+    "$@"
+else
+    echo ""
+    echo "💡 Usage:"
+    echo "   source use-node-22.sh        # Set up environment"
+    echo "   ./use-node-22.sh npm test    # Run command with Node 22"
+    echo "   ./use-node-22.sh npm start   # Start server with Node 22"
+fi