Updated Kiro Steering Docs

.kiro/steering/tech.md

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+# Technology Stack
+
+## Runtime & Dependencies
+
+- **Node.js**: >=16.0.0 (specified in package.json engines)
+- **Core Dependencies**:
+  - `@shopify/shopify-api`: ^7.7.0 - Shopify GraphQL API client
+  - `dotenv`: ^16.3.1 - Environment variable management
+  - `node-fetch`: ^3.3.2 - HTTP client for API requests
+- **Development Dependencies**:
+  - `jest`: ^29.7.0 - Testing framework
+
+## Architecture Patterns
+
+- **Service Layer Architecture**: Separation of concerns with dedicated services
+- **Configuration Management**: Centralized environment-based configuration
+- **Error Handling**: Comprehensive retry logic with exponential backoff
+- **Logging Strategy**: Dual output (console + Progress.md file)
+
+## API Integration
+
+- **Shopify GraphQL Admin API**: Version 2024-01
+- **Authentication**: Private App access tokens
+- **Rate Limiting**: Built-in handling with automatic retries
+- **Bulk Operations**: Uses `productVariantsBulkUpdate` mutation
+
+## Common Commands
+
+### Development
+
+```bash
+npm install                    # Install dependencies
+npm start                     # Run with default settings
+npm run update                # Explicit update mode
+npm run rollback              # Rollback mode
+npm run debug-tags            # Debug tag analysis
+npm test                      # Run test suite
+```
+
+### Environment Setup
+
+```bash
+copy .env.example .env        # Create environment file (Windows)
+cp .env.example .env          # Create environment file (Unix)
+```
+
+### Testing & Debugging
+
+```bash
+npm run debug-tags            # Analyze store tags before running
+npm test                      # Run Jest test suite
+```
+
+## Environment Variables
+
+Required variables (see .env.example):
+
+- `SHOPIFY_SHOP_DOMAIN`: Store domain
+- `SHOPIFY_ACCESS_TOKEN`: Admin API token
+- `TARGET_TAG`: Product tag filter
+- `PRICE_ADJUSTMENT_PERCENTAGE`: Adjustment percentage
+- `OPERATION_MODE`: "update" or "rollback"