no-mistakes(review): fix kagentz A2A status logging, tests, and contract retirement

scripts/zulip-monitor.sh

@@ -161,9 +161,16 @@ AZ_A2A_CODE=$(ssh -o StrictHostKeyChecking=no -o ConnectTimeout=5 root@192.168.6
 if [ "$AZ_A2A_CODE" = "000" ]; then
   notify "🔴" "kagentz A2A server DOWN (connection failed)"
   ISSUES=$((ISSUES + 1))
-  echo "  kagentz: ❌ A2A down" >> "$LOG"
+  echo "  kagentz: ❌ A2A down (HTTP 000)" >> "$LOG"
 else
-  echo "  kagentz: ✅ A2A alive (401 auth-gated)" >> "$LOG"
+  case "$AZ_A2A_CODE" in
+    200|401)
+      echo "  kagentz: ✅ A2A alive (HTTP $AZ_A2A_CODE)" >> "$LOG" ;;
+    *)
+      notify "🟡" "kagentz A2A server answered HTTP $AZ_A2A_CODE — running, unexpected status"
+      ISSUES=$((ISSUES + 1))
+      echo "  kagentz: 🟡 A2A unexpected http=$AZ_A2A_CODE (running, warning)" >> "$LOG" ;;
+  esac
 fi
 
 # ── Summary ──