feat(worker): add hub methods to set task status and tags freely

Adds ForceSetStatusAsync on ITaskStateService (no transition guards)
plus SetTaskStatus / SetTaskTags / GetAllTags hub methods so the UI
can edit a task's status and tags directly. PlanningHubTests ctor
updated for the new ITaskStateService dependency.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Worker/State/ITaskStateService.cs

@@ -9,6 +9,8 @@ public interface ITaskStateService
     Task<TransitionResult> CancelAsync(string taskId, DateTime finishedAt, CancellationToken ct);
     Task<TransitionResult> ResetToIdleAsync(string taskId, CancellationToken ct);
 
+    Task<TransitionResult> ForceSetStatusAsync(string taskId, ClaudeDo.Data.Models.TaskStatus status, CancellationToken ct);
+
     Task<TransitionResult> StartPlanningAsync(string parentId, CancellationToken ct);
     Task<TransitionResult> FinalizePlanningAsync(string parentId, CancellationToken ct);