feat: extract MyAgent core and web console

tests/MyAgent.Tests/Core/TaskRegistryTests.cs

@@ -0,0 +1,47 @@
+using MyAgent.Core;
+using Xunit;
+
+namespace MyAgent.Tests.Core;
+
+public sealed class TaskRegistryTests
+{
+    [Fact]
+    public void StartLease_NewerTaskCancelsPreviousAndOldTaskCannotComplete()
+    {
+        var registry = new TaskRegistry();
+        var first = CreateTask("first");
+        var second = CreateTask("second");
+
+        var firstLease = registry.StartLease(first, ["message-1"]);
+        var secondLease = registry.StartLease(second, ["message-2"]);
+
+        Assert.True(firstLease.Token.IsCancellationRequested);
+        Assert.True(secondLease.CancelledPrevious);
+        Assert.False(registry.Complete(first.TaskId, "late", firstLease.Generation));
+        Assert.True(registry.IsCurrent(secondLease));
+        Assert.True(registry.TryGet(first.TaskId, out var firstState));
+        Assert.Equal("cancelled", firstState!.Status);
+        Assert.Equal("cancelled_by_newer_message", firstState.CancellationReason);
+    }
+
+    [Fact]
+    public void Complete_IsIdempotentAndClearsCurrentOwner()
+    {
+        var registry = new TaskRegistry();
+        var task = CreateTask("only");
+        var lease = registry.StartLease(task, ["message-1"]);
+
+        Assert.True(registry.Complete(task.TaskId, "ok", lease.Generation));
+        Assert.False(registry.Complete(task.TaskId, "again", lease.Generation));
+        Assert.False(registry.IsCurrent(lease));
+    }
+
+    private static AgentTaskState CreateTask(string id) => new()
+    {
+        TaskId = id,
+        ThreadId = "group:1:user:1",
+        GroupId = "1",
+        UserId = "1",
+        MergedText = id
+    };
+}