docs: Update README - remove Kestra comparison, update status

- Remove "Kestra vs Prefect Comparison" section (decision made)
- Update project status to reflect current phase
- Simplify "Why Prefect?" section
- Clean up architecture diagram formatting

README.md

@@ -77,16 +77,6 @@ We chose [Prefect](https://prefect.io) as the orchestration engine for several r
 | **Retry & error handling** | Built-in retry policies with `@task(retries=3)` |
 | **Human-in-the-loop** | Native `pause_flow_run()` for approval workflows |
 
-### Kestra vs Prefect Comparison
-
-| Aspect | Kestra | Prefect |
-|--------|--------|---------|
-| **Workflow definition** | YAML external files | Python code (`@flow`, `@task`) |
-| **Secrets management** | ❌ Paid in OSS | ✅ Free (`Secret` blocks) |
-| **Code packaging** | Container required | Not required |
-| **Integration** | Isolated scripts | Native Python integration |
-| **Webhooks** | Built-in triggers | FastAPI + `run_deployment()` |
-
 ## 🎯 Target Fabric
 
 This project is designed for the Arista EVPN-VXLAN ContainerLab topology:
@@ -342,4 +332,4 @@ if __name__ == "__main__":
 
 ---
 
-**Status**: 🚧 Active Development - Migrating to Prefect orchestration (Phase 4)
+**Status**: 🚧 Active Development - Phase 2 (Core Components) & Phase 4 (Prefect Integration)