feat(worker): route Serilog Warn/Error to footer + buffer recent logs for overlay

tests/ClaudeDo.Worker.Tests/Logging/LogRingBufferTests.cs

@@ -0,0 +1,48 @@
+using ClaudeDo.Data.Models;
+using ClaudeDo.Worker.Logging;
+
+namespace ClaudeDo.Worker.Tests.Logging;
+
+public class LogRingBufferTests
+{
+    private static readonly DateTime Now = new(2026, 6, 23, 8, 0, 0, DateTimeKind.Utc);
+
+    private static WorkerLogRecord Rec(DateTime ts, string msg = "m", WorkerLogLevel lvl = WorkerLogLevel.Info)
+        => new(msg, lvl, ts);
+
+    [Fact]
+    public void Evicts_records_older_than_window_on_append()
+    {
+        var buf = new LogRingBuffer(TimeSpan.FromMinutes(30), utcNow: () => Now);
+        buf.Append(Rec(Now.AddMinutes(-40), "old"));
+        buf.Append(Rec(Now.AddMinutes(-10), "recent"));
+
+        var snap = buf.Snapshot();
+
+        Assert.Single(snap);
+        Assert.Equal("recent", snap[0].Message);
+    }
+
+    [Fact]
+    public void Evicts_oldest_beyond_cap()
+    {
+        var buf = new LogRingBuffer(TimeSpan.FromHours(1), cap: 3, utcNow: () => Now);
+        for (var i = 0; i < 5; i++) buf.Append(Rec(Now, $"m{i}"));
+
+        var snap = buf.Snapshot();
+
+        Assert.Equal(3, snap.Count);
+        Assert.Equal(new[] { "m2", "m3", "m4" }, snap.Select(r => r.Message));
+    }
+
+    [Fact]
+    public void Snapshot_is_oldest_first()
+    {
+        var buf = new LogRingBuffer(TimeSpan.FromHours(1), utcNow: () => Now);
+        buf.Append(Rec(Now.AddMinutes(-3), "a"));
+        buf.Append(Rec(Now.AddMinutes(-2), "b"));
+        buf.Append(Rec(Now.AddMinutes(-1), "c"));
+
+        Assert.Equal(new[] { "a", "b", "c" }, buf.Snapshot().Select(r => r.Message));
+    }
+}