feat(worker): in-app interactive session service, replacing the wt terminal launch

InteractiveSessionService resolves a task's list working dir + seeded prompt,
spawns a StreamingClaudeSession (claude stream-json in the list dir, model+auto
as before), registers it in LiveSessionRegistry, streams output over TaskMessage,
and broadcasts InteractiveSessionStarted/Ended (an exit watcher fires Ended). The
hub's OpenInteractiveTerminalAsync now starts this in-app session; SendInteractiveMessage
and StopInteractiveSession route to it. The external Windows-Terminal interactive
launch (LaunchInteractiveAsync / InteractiveLaunchContext / OpenInteractiveAsync) is
removed; planning sessions keep their terminal launch.

src/ClaudeDo.Worker/Hub/HubBroadcaster.cs

@@ -77,4 +77,10 @@ public sealed class HubBroadcaster : IPrimeBroadcaster, IRefineBroadcaster
     Task IRefineBroadcaster.RefineStartedAsync(string taskId) => RefineStarted(taskId);
     Task IRefineBroadcaster.RefineFinishedAsync(string taskId, bool success, string? error) =>
         RefineFinished(taskId, success, error);
+
+    public Task InteractiveSessionStarted(string taskId) =>
+        _hub.Clients.All.SendAsync("InteractiveSessionStarted", taskId);
+
+    public Task InteractiveSessionEnded(string taskId) =>
+        _hub.Clients.All.SendAsync("InteractiveSessionEnded", taskId);
 }

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -9,6 +9,7 @@ using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Logging;
 using ClaudeDo.Worker.Online;
 using ClaudeDo.Worker.Planning;
+using ClaudeDo.Worker.Runner;
 using ClaudeDo.Worker.Prime;
 using ClaudeDo.Worker.Queue;
 using ClaudeDo.Worker.Refine;
@@ -116,6 +117,7 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
     private readonly OnlineInboxConfig _onlineInboxConfig;
     private readonly OnlineTokenStore _onlineTokenStore;
     private readonly Runner.PendingQuestionRegistry _pendingQuestions;
+    private readonly InteractiveSessionService _interactive;
     private readonly LogRingBuffer? _logBuffer;
 
     public WorkerHub(
@@ -142,6 +144,7 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         OnlineInboxConfig onlineInboxConfig,
         OnlineTokenStore onlineTokenStore,
         Runner.PendingQuestionRegistry pendingQuestions,
+        InteractiveSessionService interactive,
         LogRingBuffer? logBuffer = null)
     {
         _queue = queue;
@@ -167,6 +170,7 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         _onlineInboxConfig = onlineInboxConfig;
         _onlineTokenStore = onlineTokenStore;
         _pendingQuestions = pendingQuestions;
+        _interactive = interactive;
         _logBuffer = logBuffer;
     }
 
@@ -568,11 +572,14 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         return ctx;
     }
 
-    public async Task OpenInteractiveTerminalAsync(string taskId)
-    {
-        var ctx = await _planning.OpenInteractiveAsync(taskId, Context.ConnectionAborted);
-        await _launcher.LaunchInteractiveAsync(ctx, Context.ConnectionAborted);
-    }
+    public Task OpenInteractiveTerminalAsync(string taskId) =>
+        _interactive.StartAsync(taskId, Context.ConnectionAborted);
+
+    public Task SendInteractiveMessage(string taskId, string text) =>
+        _interactive.SendAsync(taskId, text, Context.ConnectionAborted);
+
+    public Task StopInteractiveSession(string taskId) =>
+        _interactive.StopAsync(taskId, Context.ConnectionAborted);
 
     public async Task<DiscardPlanningOutcome> DiscardPlanningSessionAsync(string taskId, bool dequeueQueuedChildren = false)
     {