refactor(ui): bring IWorkerClient to parity with WorkerClient

Add 16 missing members to IWorkerClient (IsReconnecting, WorkerLogReceivedEvent,
PrimeFired, LastApproveTarget, Refresh/RestoreDefaultAgents, UpdateAppSettings,
prime schedule CRUD, UpdateList/UpdateListConfig, all worktree ops).
Switch all production consumers off the concrete WorkerClient type; only
Program.cs/App host still resolves the concrete registration.
Update StubWorkerClient and FakeWorkerClient to satisfy the expanded interface.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/Modals/ListSettingsModalViewModel.cs

@@ -12,7 +12,7 @@ namespace ClaudeDo.Ui.ViewModels.Modals;
 
 public sealed partial class ListSettingsModalViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
     private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
 
     public string ListId { get; set; } = "";
@@ -50,7 +50,7 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
 
     public Action? CloseAction { get; set; }
 
-    public ListSettingsModalViewModel(WorkerClient worker, IDbContextFactory<ClaudeDoDbContext> dbFactory)
+    public ListSettingsModalViewModel(IWorkerClient worker, IDbContextFactory<ClaudeDoDbContext> dbFactory)
     {
         _worker = worker;
         _dbFactory = dbFactory;

src/ClaudeDo.Ui/ViewModels/Modals/MergeModalViewModel.cs

@@ -8,7 +8,7 @@ namespace ClaudeDo.Ui.ViewModels.Modals;
 
 public sealed partial class MergeModalViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
 
     public string TaskId { get; set; } = "";
     public string TaskTitle { get; set; } = "";
@@ -32,7 +32,7 @@ public sealed partial class MergeModalViewModel : ViewModelBase
     /// close itself after this modal closes.
     public bool Merged { get; private set; }
 
-    public MergeModalViewModel(WorkerClient worker)
+    public MergeModalViewModel(IWorkerClient worker)
     {
         _worker = worker;
     }

src/ClaudeDo.Ui/ViewModels/Modals/Settings/FilesSettingsTabViewModel.cs

@@ -9,7 +9,7 @@ namespace ClaudeDo.Ui.ViewModels.Modals.Settings;
 
 public sealed partial class FilesSettingsTabViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
 
     [ObservableProperty] private string _statusMessage = "";
     [ObservableProperty] private bool _isBusy;
@@ -21,7 +21,7 @@ public sealed partial class FilesSettingsTabViewModel : ViewModelBase
     public string DailyPrepPromptPath { get; } = PromptFiles.PathFor(PromptKind.DailyPrep);
     public string WeeklyReportPromptPath { get; } = PromptFiles.PathFor(PromptKind.WeeklyReport);
 
-    public FilesSettingsTabViewModel(WorkerClient worker) => _worker = worker;
+    public FilesSettingsTabViewModel(IWorkerClient worker) => _worker = worker;
 
     [RelayCommand]
     private async Task RestoreDefaultAgents()

src/ClaudeDo.Ui/ViewModels/Modals/Settings/WorktreesSettingsTabViewModel.cs

@@ -8,7 +8,7 @@ namespace ClaudeDo.Ui.ViewModels.Modals.Settings;
 
 public sealed partial class WorktreesSettingsTabViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
 
     [ObservableProperty] private string _worktreeStrategy = "sibling";
     [ObservableProperty] private string? _centralWorktreeRoot;
@@ -21,7 +21,7 @@ public sealed partial class WorktreesSettingsTabViewModel : ViewModelBase
 
     public IReadOnlyList<string> WorktreeStrategies { get; } = new[] { "sibling", "central" };
 
-    public WorktreesSettingsTabViewModel(WorkerClient worker) => _worker = worker;
+    public WorktreesSettingsTabViewModel(IWorkerClient worker) => _worker = worker;
 
     public string? Validate()
     {

src/ClaudeDo.Ui/ViewModels/Modals/SettingsModalViewModel.cs

@@ -11,7 +11,7 @@ namespace ClaudeDo.Ui.ViewModels.Modals;
 
 public sealed partial class SettingsModalViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
 
     public GeneralSettingsTabViewModel General { get; }
     public WorktreesSettingsTabViewModel Worktrees { get; }
@@ -24,7 +24,7 @@ public sealed partial class SettingsModalViewModel : ViewModelBase
 
     public Action? CloseAction { get; set; }
 
-    public SettingsModalViewModel(WorkerClient worker, PrimeClaudeTabViewModel prime,
+    public SettingsModalViewModel(IWorkerClient worker, PrimeClaudeTabViewModel prime,
                                   ILocalizer localizer, AppSettings appSettings)
     {
         _worker = worker;

src/ClaudeDo.Ui/ViewModels/Modals/WorktreesOverviewModalViewModel.cs

@@ -60,7 +60,7 @@ public sealed partial class WorktreesGroupViewModel : ViewModelBase
 
 public sealed partial class WorktreesOverviewModalViewModel : ViewModelBase
 {
-    private readonly WorkerClient _worker;
+    private readonly IWorkerClient _worker;
     private readonly Func<WorktreeModalViewModel> _diffVmFactory;
 
     [ObservableProperty] private string? _listIdFilter;
@@ -89,7 +89,7 @@ public sealed partial class WorktreesOverviewModalViewModel : ViewModelBase
     public Func<MergeModalViewModel>? ResolveMergeVm { get; set; }
     public Func<MergeModalViewModel, Task>? ShowMergeAction { get; set; }
 
-    public WorktreesOverviewModalViewModel(WorkerClient worker, Func<WorktreeModalViewModel> diffVmFactory)
+    public WorktreesOverviewModalViewModel(IWorkerClient worker, Func<WorktreeModalViewModel> diffVmFactory)
     {
         _worker = worker;
         _diffVmFactory = diffVmFactory;