docs: Add fully automated pipeline documentation

AUTOMATED_PIPELINE.md

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+# 🚀 Fully Automated Deployment Pipeline
+
+## 🎯 Complete Auto-Promotion Flow
+
+Your deployment pipeline is now **100% automated** with no manual approval gates!
+
+### 📋 Workflow Overview
+
+```mermaid
+graph TD
+    A[Feature Branch] --> B[Create PR to develop]
+    B --> C[Merge to develop]
+    C --> D[🚀 Auto Deploy to DEV]
+    D --> E{DEV Tests Pass?}
+    E -->|✅ Yes| F[🔄 Auto-merge develop → staging]
+    E -->|❌ No| G[❌ Stop Pipeline]
+    F --> H[🚀 Auto Deploy to STAGING]
+    H --> I{STAGING Tests Pass?}
+    I -->|✅ Yes| J[🔄 Auto-merge staging → main]
+    I -->|❌ No| K[❌ Stop Pipeline]
+    J --> L[🚀 Auto Deploy to PRODUCTION]
+    L --> M[✅ Live in Production!]
+```
+
+### 🎪 Your Development Workflow
+
+1. **Create Feature Branch:**
+   ```bash
+   git checkout develop
+   git pull origin develop
+   git checkout -b feature/awesome-new-feature
+   # Make your changes
+   git add .
+   git commit -m "feat: awesome new feature"
+   git push origin feature/awesome-new-feature
+   ```
+
+2. **Create PR and Merge to develop**
+   - GitHub PR from `feature/awesome-new-feature` → `develop`
+   - Review and merge
+
+3. **Sit Back and Watch the Magic! ✨**
+   ```
+   develop → DEV environment (automatic)
+   ↓ (if tests pass)
+   develop → staging branch (automatic)
+   ↓
+   staging → STAGING environment (automatic)
+   ↓ (if tests pass)  
+   staging → main branch (automatic) ← NO APPROVAL NEEDED!
+   ↓
+   main → PRODUCTION environment (automatic)
+   ```
+
+### 🌐 Environment URLs
+
+After deployment, your game will be available at:
+
+- **DEV:** `https://game-2048-dev.game-2048-dev.dev.wa.darknex.us`
+- **STAGING:** `https://game-2048-staging.game-2048-staging.staging.wa.darknex.us`  
+- **PRODUCTION:** `https://game-2048-prod.game-2048-prod.wa.darknex.us`
+
+### 🔍 Pipeline Monitoring
+
+Monitor your deployments in:
+1. **GitHub Actions** tab - see all workflows
+2. **Webhook Handler Logs:**
+   ```bash
+   kubectl logs -n webhook-system -l app=webhook-handler -f
+   ```
+3. **Knative Service Status:**
+   ```bash
+   # Dev
+   kubectl get ksvc -n game-2048-dev
+   
+   # Staging  
+   kubectl get ksvc -n game-2048-staging
+   
+   # Production
+   kubectl get ksvc -n game-2048-prod
+   ```
+
+### ⚡ Quick Test
+
+Want to test the pipeline? Make a small change:
+
+```bash
+git checkout develop
+# Edit any file in src/
+git add .
+git commit -m "test: trigger full pipeline"
+git push origin develop
+```
+
+Then watch as your change automatically flows through DEV → STAGING → PRODUCTION! 🎉
+
+### 🛡️ Safety Features
+
+Even though it's fully automated, you still have safety checks:
+- **Comprehensive testing** at each stage
+- **Health checks** before promotion
+- **SSL certificate validation**
+- **Content validation**
+- **Performance testing**
+- **Automatic rollback** if any stage fails
+
+### 🎮 Ready to Ship!
+
+Your pipeline is now ready for:
+- ✅ Continuous deployment
+- ✅ Feature flags via environment badges
+- ✅ Multi-environment testing
+- ✅ Zero-downtime deployments
+- ✅ Automatic scaling
+- ✅ Full observability
+
+Happy coding! 🚀