docs: update hub CHANGELOG and README for v0.2.2

Add config hash comparison feature to changelog. Bump version references.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hub/CHANGELOG.md

@@ -1,5 +1,16 @@
 # Felhom Hub — Changelog
 
+## v0.2.2 (2026-02-20)
+
+**Config Hash Comparison**
+
+- **Config sync status** on unified customer page: compares SHA256 hash of controller's
+  `controller.yaml` (from report payload) against Hub-generated YAML. Shows "In sync",
+  "Config mismatch", or "Unknown" (controller needs v0.20.0+ to report hash).
+- Visible in the Controller Update section next to Push Config button.
+
+---
+
 ## v0.2.1 (2026-02-20)
 
 **Unified Customer Management**

hub/README.md

@@ -4,7 +4,7 @@
 
 A lightweight Go service that receives periodic reports from felhom-controller instances, stores them in SQLite, and provides a web dashboard for fleet monitoring. Also serves as the infrastructure backup store for disaster recovery.
 
-**Current version: v0.2.1**
+**Current version: v0.2.2**
 
 ---
 
@@ -195,10 +195,10 @@ Runs on k3s (Kubernetes) in the `felhom-system` namespace:
 ```bash
 # Build and push
 cd hub/
-make VERSION=0.2.1 docker docker-push
+make VERSION=0.2.2 docker docker-push
 
 # Deploy
-kubectl set image -n felhom-system deploy/hub hub=gitea.dooplex.hu/admin/felhom-hub:v0.2.1
+kubectl set image -n felhom-system deploy/hub hub=gitea.dooplex.hu/admin/felhom-hub:v0.2.2
 kubectl rollout status -n felhom-system deploy/hub
 
 # Check