feat(worker): add WorkerLog SignalR event

src/ClaudeDo.Worker/Hub/HubBroadcaster.cs

@@ -1,3 +1,4 @@
+using ClaudeDo.Data.Models;
 using Microsoft.AspNetCore.SignalR;
 
 namespace ClaudeDo.Worker.Hub;
@@ -28,4 +29,7 @@ public sealed class HubBroadcaster
 
     public Task RunCreated(string taskId, int runNumber, bool isRetry) =>
         _hub.Clients.All.SendAsync("RunCreated", taskId, runNumber, isRetry);
+
+    public Task WorkerLog(string message, WorkerLogLevel level, DateTime timestampUtc) =>
+        _hub.Clients.All.SendAsync("WorkerLog", message, level, timestampUtc);
 }

src/ClaudeDo.Worker/Program.cs

@@ -20,7 +20,10 @@ builder.Services.AddDbContextFactory<ClaudeDoDbContext>(opt =>
 
 builder.Services.AddSingleton(cfg);
 builder.Services.AddHostedService<StaleTaskRecovery>();
-builder.Services.AddSignalR();
+builder.Services.AddSignalR().AddJsonProtocol(options =>
+{
+    options.PayloadSerializerOptions.Converters.Add(new System.Text.Json.Serialization.JsonStringEnumConverter());
+});
 
 // Runner stack.
 builder.Services.AddSingleton<IClaudeProcess, ClaudeProcess>();