semi implemented and features implemented save checkpoint

docs/features/unchecked/releaseorchestrator/traffic-manager-with-load-balancer-adapters.md

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+# Traffic Manager with Load Balancer Adapters
+
+## Module
+ReleaseOrchestrator
+
+## Status
+IMPLEMENTED
+
+## Description
+Traffic management abstraction with adapters for Nginx Plus, HAProxy, Traefik, and AWS ALB, enabling weighted traffic splitting for canary and blue-green deployments.
+
+## Implementation Details
+- **Modules**: `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/`, `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/`
+- **Key Classes**:
+  - `TrafficManager` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.ProgressiveDelivery/TrafficManager.cs`) - high-level traffic management with weighted splitting for canary and blue-green
+  - `TrafficRouterRegistry` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/TrafficRouterRegistry.cs`) - registry of traffic router implementations (adapters)
+  - `InMemoryTrafficRouter` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Progressive/Routing/InMemoryTrafficRouter.cs`) - in-memory traffic router for testing and development
+- **Interfaces**: `ITrafficManager`, `ITrafficRouter`
+- **Source**: SPRINT_20260117_035
+
+## E2E Test Plan
+- [ ] Register a traffic router adapter with `TrafficRouterRegistry` and verify it is available
+- [ ] Set weighted traffic split (e.g., 90/10) via `TrafficManager` and verify the split is applied
+- [ ] Verify canary traffic progression: increase weight incrementally and confirm routing changes
+- [ ] Verify blue-green switch: flip traffic 100% to the new version and confirm full cutover
+- [ ] Verify `InMemoryTrafficRouter` correctly tracks routing state for testing