feat!: pre-handshake knock on the agent TCP ports; probes get the agent certificate public key [CI]

backend/probe/tests/MoShiro.Probe.Tests/ProbeTests.cs

@@ -58,7 +58,7 @@ public sealed class ProbeTests
     private static ProbeAgentList List(long version, params string[] ids) => new()
     {
         Version = version,
-        Agents = [.. ids.Select(id => new AgentEndpoint { AgentId = new NodeId(id), Host = id + ".example", TcpPort = 7443, Spki = "c3BraQ==" })],
+        Agents = [.. ids.Select(id => new AgentEndpoint { AgentId = new NodeId(id), Host = id + ".example", TcpPort = 7443, PublicKey = "c3BraQ==" })],
     };
 
     [Fact]