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/State/TaskStateServiceTests.cs

@@ -1,10 +1,12 @@
 using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
+using ClaudeDo.Worker.Git;
 using ClaudeDo.Worker.Planning;
 using ClaudeDo.Worker.State;
 using ClaudeDo.Worker.Tests.Infrastructure;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging.Abstractions;
 using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
 
 namespace ClaudeDo.Worker.Tests.State;
@@ -22,6 +24,9 @@ public sealed class TaskStateServiceTests : IDisposable
     private readonly TaskStateServiceBuilder.Built _built;
     private readonly ITaskStateService _sut;
     private readonly string _listId;
+    private readonly List<GitRepoFixture> _repos = new();
+
+    private static bool GitAvailable => GitRepoFixture.IsGitAvailable();
 
     public TaskStateServiceTests()
     {
@@ -41,7 +46,19 @@ public sealed class TaskStateServiceTests : IDisposable
         ctx.SaveChanges();
     }
 
-    public void Dispose() => _db.Dispose();
+    public void Dispose()
+    {
+        foreach (var r in _repos) r.Dispose();
+        _db.Dispose();
+    }
+
+    private async Task SetListWorkingDirAsync(string workingDir)
+    {
+        await using var ctx = _factory.CreateDbContext();
+        var list = await ctx.Lists.FirstAsync(l => l.Id == _listId);
+        list.WorkingDir = workingDir;
+        await ctx.SaveChangesAsync();
+    }
 
     private async Task<string> SeedTaskAsync(
         TaskStatus status,
@@ -98,6 +115,74 @@ public sealed class TaskStateServiceTests : IDisposable
         Assert.Contains(_built.Hub.Proxy.Calls, c => c.Method == "TaskUpdated");
     }
 
+    [Fact]
+    public async Task EnqueueAsync_NoWorkingDir_QueuesNormally_NoBaseDirtyWarning()
+    {
+        // The list created in the constructor has no WorkingDir -- covers the
+        // "no valid repo" acceptance case: queuing must not throw or block.
+        var id = await SeedTaskAsync(TaskStatus.Idle);
+
+        var result = await _sut.EnqueueAsync(id, default);
+
+        Assert.True(result.Ok);
+        Assert.Null(result.BaseDirty);
+        Assert.Equal(TaskStatus.Queued, await GetStatusAsync(id));
+    }
+
+    [Fact]
+    public async Task EnqueueAsync_CleanBaseRepo_NoBaseDirtyWarning()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = new GitRepoFixture();
+        _repos.Add(repo);
+        await SetListWorkingDirAsync(repo.RepoDir);
+        var id = await SeedTaskAsync(TaskStatus.Idle);
+
+        var result = await _sut.EnqueueAsync(id, default);
+
+        Assert.True(result.Ok);
+        Assert.Null(result.BaseDirty);
+    }
+
+    [Fact]
+    public async Task EnqueueAsync_UntrackedFileInBaseRepo_ReturnsBaseDirtyWarning()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = new GitRepoFixture();
+        _repos.Add(repo);
+        File.WriteAllText(Path.Combine(repo.RepoDir, "new-file.txt"), "not committed");
+        await SetListWorkingDirAsync(repo.RepoDir);
+        var id = await SeedTaskAsync(TaskStatus.Idle);
+
+        var result = await _sut.EnqueueAsync(id, default);
+
+        Assert.True(result.Ok);
+        Assert.NotNull(result.BaseDirty);
+        Assert.Equal(0, result.BaseDirty!.ModifiedCount);
+        Assert.Equal(1, result.BaseDirty!.UntrackedCount);
+    }
+
+    [Fact]
+    public async Task EnqueueAsync_ModifiedFileInBaseRepo_ReturnsBaseDirtyWarning()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = new GitRepoFixture();
+        _repos.Add(repo);
+        File.WriteAllText(Path.Combine(repo.RepoDir, "README.md"), "changed on disk");
+        await SetListWorkingDirAsync(repo.RepoDir);
+        var id = await SeedTaskAsync(TaskStatus.Idle);
+
+        var result = await _sut.EnqueueAsync(id, default);
+
+        Assert.True(result.Ok);
+        Assert.NotNull(result.BaseDirty);
+        Assert.Equal(1, result.BaseDirty!.ModifiedCount);
+        Assert.Equal(0, result.BaseDirty!.UntrackedCount);
+    }
+
     [Fact]
     public async Task EnqueueAsync_ManualTask_Rejected_AndStaysIdle()
     {