Security cleanup: Remove sensitive files, test scripts, and add .env.example

- Removed cortex demo/test files
- Removed test shell scripts
- Removed Claude AI persona scripts
- Fixed hardcoded URLs (dpsifr.workers.dev -> api.soulcraft.com)
- Fixed hardcoded paths in documentation
- Added .env.example for configuration
- Cleaned up temporary test files

.env.example

@@ -0,0 +1,53 @@
+# Brainy Configuration Example
+# Copy this file to .env and fill in your values
+
+# ===================================
+# Core Configuration
+# ===================================
+NODE_ENV=development
+DEBUG=false
+LOG_LEVEL=info
+
+# ===================================
+# Brain Cloud Configuration (Optional)
+# ===================================
+# Sign up at https://soulcraft.com/brain-cloud
+BRAIN_CLOUD_URL=https://api.soulcraft.com/brain-cloud
+BRAIN_CLOUD_KEY=
+BRAIN_CLOUD_CUSTOMER_ID=
+
+# ===================================
+# Licensing (Optional)
+# ===================================
+# Get your license at https://soulcraft.com
+BRAINY_LICENSE_KEY=
+
+# ===================================
+# LLM API Keys (Optional)
+# ===================================
+# Required only if using BrainyChat features
+ANTHROPIC_API_KEY=
+OPENAI_API_KEY=
+
+# ===================================
+# AWS S3 Storage (Optional)
+# ===================================
+# Required only if using S3 storage adapter
+AWS_ACCESS_KEY_ID=
+AWS_SECRET_ACCESS_KEY=
+AWS_REGION=us-east-1
+S3_BUCKET_NAME=
+
+# ===================================
+# MCP Server Configuration (Optional)
+# ===================================
+# For Claude integration via MCP
+CUSTOMER_ID=
+MCP_SERVER_PORT=3000
+
+# ===================================
+# Development/Testing
+# ===================================
+# Test environment settings
+TEST_TIMEOUT=30000
+VITEST_WORKERS=1