feat!: probes generate their own keys and enroll with a join token; node and peer keys are separate [CI]

backend/tests/MoShiro.Backend.Tests/LinkTests.cs

@@ -30,7 +30,7 @@ public sealed class LinkTests
     public async Task Links_FollowTheAutomaticSwitch_AndManualChoicesAlwaysWin()
     {
         await using AgentSimulator agent = await _backend.ConnectAgentAsync();
-        string probe = (await _backend.CreateProbeAsync())["probe_id"]!.GetValue<string>();
+        string probe = await _backend.CreateProbeIdAsync();
         string agentId = agent.NodeId.Value;
         try
         {
@@ -72,7 +72,7 @@ public sealed class LinkTests
     public async Task Links_RefuseUnknownNodes()
     {
         await using AgentSimulator agent = await _backend.ConnectAgentAsync();
-        string probe = (await _backend.CreateProbeAsync())["probe_id"]!.GetValue<string>();
+        string probe = await _backend.CreateProbeIdAsync();
         using HttpResponseMessage noProbe = await SetLinkAsync("prb_missing", agent.NodeId.Value, false);
         Assert.Equal(HttpStatusCode.NotFound, noProbe.StatusCode);
         using HttpResponseMessage noAgent = await SetLinkAsync(probe, "agt_missing", false);