feat(queue): warn when the base branch has uncommitted changes

Queuing (update_task_status, batch_update_task_status) and run_task_now
now surface a non-blocking baseDirty warning (separate modified/untracked
counts) when the list's working dir has uncommitted changes at enqueue
time, since a new worktree forks from the commit tip and silently misses
them. BaseDirtyChecker caches per working dir for a few seconds so a
batch queue over many tasks in one list only shells out to git once. The
UI surfaces the same warning via the footer error strip on queue actions.

tests/ClaudeDo.Worker.Tests/External/AddSubtaskToolTests.cs

@@ -2,6 +2,7 @@ using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
 using ClaudeDo.Worker.External;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Planning;
@@ -86,7 +87,8 @@ public sealed class AddSubtaskToolTests : IDisposable
         return new ExternalMcpService(
             _tasks, _lists, queue, broadcaster,
             state,
-            git, dbFactory, maintenance, merge, planningMerge);
+            git, dbFactory, maintenance, merge, planningMerge,
+            new BaseDirtyChecker(git, NullLogger<BaseDirtyChecker>.Instance));
     }
 
     [Fact]

tests/ClaudeDo.Worker.Tests/External/BatchMcpToolsTests.cs

@@ -4,6 +4,7 @@ using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
 using ClaudeDo.Worker.Config;
 using ClaudeDo.Worker.External;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Planning;
@@ -24,6 +25,9 @@ public sealed class BatchMcpToolsTests : IDisposable
     private readonly TaskRepository _tasks;
     private readonly ListRepository _lists;
     private readonly HubBroadcaster _broadcaster;
+    private readonly List<GitRepoFixture> _repos = new();
+
+    private static bool GitAvailable => GitRepoFixture.IsGitAvailable();
 
     public BatchMcpToolsTests()
     {
@@ -35,14 +39,15 @@ public sealed class BatchMcpToolsTests : IDisposable
 
     public void Dispose()
     {
+        foreach (var r in _repos) r.Dispose();
         _ctx.Dispose();
         _db.Dispose();
     }
 
-    private async Task<string> SeedListAsync()
+    private async Task<string> SeedListAsync(string? workingDir = null)
     {
         var id = Guid.NewGuid().ToString();
-        await _lists.AddAsync(new ListEntity { Id = id, Name = "L", CreatedAt = DateTime.UtcNow });
+        await _lists.AddAsync(new ListEntity { Id = id, Name = "L", CreatedAt = DateTime.UtcNow, WorkingDir = workingDir });
         return id;
     }
 
@@ -74,7 +79,8 @@ public sealed class BatchMcpToolsTests : IDisposable
         var svc = new ExternalMcpService(
             _tasks, _lists, CreateQueue(), _broadcaster,
             state,
-            git, factory, maintenance, merge, planningMerge);
+            git, factory, maintenance, merge, planningMerge,
+            new BaseDirtyChecker(git, NullLogger<BaseDirtyChecker>.Instance));
         return new BatchMcpTools(svc);
     }
 
@@ -247,6 +253,32 @@ public sealed class BatchMcpToolsTests : IDisposable
         Assert.Equal(TaskStatus.Queued, (await _tasks.GetByIdAsync(t2.Id))!.Status);
     }
 
+    [Fact]
+    public async Task BatchUpdateTaskStatus_DirtyBaseRepo_ReportsWarningPerItem_OneListOneRepo()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = new GitRepoFixture();
+        _repos.Add(repo);
+        File.WriteAllText(Path.Combine(repo.RepoDir, "scratch.txt"), "new");
+
+        var listId = await SeedListAsync(repo.RepoDir);
+        var t1 = await SeedTaskAsync(listId, "a", TaskStatus.Idle);
+        var t2 = await SeedTaskAsync(listId, "b", TaskStatus.Idle);
+        var sut = BuildSut();
+
+        // Two tasks queued from the same list -- BaseDirtyChecker's TTL cache means only one
+        // `git status` actually runs underneath, but both items still see the warning.
+        var results = await sut.BatchUpdateTaskStatus(new[] { t1.Id, t2.Id }, "Queued", CancellationToken.None);
+
+        Assert.All(results, r => Assert.True(r.Ok));
+        Assert.All(results, r =>
+        {
+            Assert.NotNull(r.BaseDirty);
+            Assert.Equal(1, r.BaseDirty!.UntrackedCount);
+        });
+    }
+
     [Fact]
     public async Task BatchUpdateTaskStatus_Done_MixedWorktreeState_ReportsPerItemAndDoesNotAbort()
     {

tests/ClaudeDo.Worker.Tests/External/ExternalMcpServiceTests.cs

@@ -4,6 +4,7 @@ using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
 using ClaudeDo.Worker.Config;
 using ClaudeDo.Worker.External;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Hub;
 using ClaudeDo.Worker.Lifecycle;
 using ClaudeDo.Worker.Planning;
@@ -136,7 +137,8 @@ public sealed class ExternalMcpServiceTests : IDisposable
         return new ExternalMcpService(
             _tasks, _lists, queue, _broadcaster,
             state,
-            git, factory, maintenance, merge, planningMerge);
+            git, factory, maintenance, merge, planningMerge,
+            new BaseDirtyChecker(git, NullLogger<BaseDirtyChecker>.Instance));
     }
 
     private QueueService CreateQueue()