feat(audit): M5.2 per-node stuck-count KPIs (T6) — repo per-node aggregation, actor message pair, CentralUI tiles

src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Audit/SiteCallQueries.cs

@@ -164,3 +164,24 @@ public sealed record PerSiteSiteCallKpiResponse(
     bool Success,
     string? ErrorMessage,
     IReadOnlyList<SiteCallSiteKpiSnapshot> Sites);
+
+/// <summary>
+/// Site Calls UI -> Central: request for the per-node <c>SiteCalls</c>
+/// KPI breakdown. Mirrors <see cref="PerSiteSiteCallKpiRequest"/> but groups
+/// by <c>SourceNode</c> instead of <c>SourceSite</c>. Additive — does not
+/// change per-site behaviour.
+/// </summary>
+public sealed record PerNodeSiteCallKpiRequest(
+    string CorrelationId);
+
+/// <summary>
+/// Central -> Site Calls UI: per-node KPI breakdown for the Site Calls KPIs
+/// page. On a repository fault <see cref="Success"/> is <c>false</c>,
+/// <see cref="ErrorMessage"/> carries the cause, and <see cref="Nodes"/> is empty.
+/// Nodes with a <c>NULL</c> <c>SourceNode</c> are omitted.
+/// </summary>
+public sealed record PerNodeSiteCallKpiResponse(
+    string CorrelationId,
+    bool Success,
+    string? ErrorMessage,
+    IReadOnlyList<SiteCallNodeKpiSnapshot> Nodes);