[CI] [SKIP TESTS] Add detailed Probe-Agent connection diagnostics

backend/fleet/src/Fleet.Core/ContextNodeLog.cs

@@ -0,0 +1,8 @@
+namespace Fleet.Core;
+
+/// <summary>Adds stable diagnostic context to every event in one operation.</summary>
+public sealed class ContextNodeLog(INodeLog inner, params (string Key, object? Value)[] context) : INodeLog
+{
+    public void Write(NodeLogLevel level, string message, params (string Key, object? Value)[] fields) =>
+        inner.Write(level, message, [.. context, .. fields]);
+}