fix(worktrees): detect external merges, clean up empty dirs, prune in owning repo

- ContentInMain: HEAD ancestor of the default branch or squash-merged
  (merge-tree == target tree), against local origin/<default> without fetch;
  list_worktrees mergedIntoMain and the overview modal ("merged (external)")
  use it, "Cleanup finished" takes clean Active rows that are in main
- cleanup_task_worktree skips the dirty check for a non-git directory
- prune / worktree remove / branch -D run in the repo owning the worktree
  (git-common-dir), not the list's working dir; branch already gone reports
  branchDeleted=true

src/ClaudeDo.Data/Git/GitService.cs

@@ -489,6 +489,13 @@ public sealed class GitService
         return head.StartsWith("origin/", StringComparison.Ordinal) ? head["origin/".Length..] : head;
     }
 
+    /// <summary>Absolute path of the <c>.git</c> dir shared by all worktrees of the repo owning <paramref name="dir"/>, or null.</summary>
+    public async Task<string?> GetCommonDirAsync(string dir, CancellationToken ct = default)
+    {
+        var (exitCode, stdout, _) = await RunGitAsync(dir, ["rev-parse", "--path-format=absolute", "--git-common-dir"], ct);
+        return exitCode == 0 && !string.IsNullOrWhiteSpace(stdout) ? stdout.Trim() : null;
+    }
+
     /// <summary><c>git merge --ff-only</c>: moves the checked-out branch to <paramref name="sourceRef"/> or fails without touching it.</summary>
     public async Task<(int ExitCode, string Stderr)> MergeFastForwardOnlyAsync(
         string worktreePath, string sourceRef, CancellationToken ct = default)

src/ClaudeDo.Data/Wire.cs

@@ -88,7 +88,8 @@ public record WorktreeOverviewDto(
     string? DiffStat,
     DateTime CreatedAt,
     bool PathExistsOnDisk,
-    int TaskNumber = 0);
+    int TaskNumber = 0,
+    bool ContentInMain = false);
 
 public record ForceRemoveResultDto(bool Removed, string? Reason);
 

src/ClaudeDo.Localization/locales/de.json

@@ -555,6 +555,8 @@
       "resolve": "Lösen",
       "phantom": "Phantom",
       "phantomTooltip": "Verzeichnis fehlt auf der Festplatte",
+      "mergedExternal": "gemergt (extern)",
+      "mergedExternalTooltip": "Die Commits sind schon im Default-Branch (lokaler origin-Stand, ohne Fetch), z.B. per Squash-PR. \"Abgeschlossene aufräumen\" entfernt ihn.",
       "ctxShowDiff": "Diff anzeigen",
       "ctxOpenInExplorer": "Im Explorer öffnen",
       "ctxJumpToTask": "Zur Aufgabe springen",

src/ClaudeDo.Localization/locales/en.json

@@ -555,6 +555,8 @@
       "resolve": "Resolve",
       "phantom": "phantom",
       "phantomTooltip": "Directory missing on disk",
+      "mergedExternal": "merged (external)",
+      "mergedExternalTooltip": "Its commits are already in the default branch (local origin ref, not fetched) — e.g. a squash PR. \"Cleanup finished\" removes it.",
       "ctxShowDiff": "Show diff",
       "ctxOpenInExplorer": "Open in Explorer",
       "ctxJumpToTask": "Jump to task",

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

@@ -33,6 +33,8 @@ public sealed partial class WorktreeOverviewRowViewModel : ViewModelBase
     [ObservableProperty] private string? _diffStat;
     [ObservableProperty][NotifyPropertyChangedFor(nameof(AgeText))] private DateTime _createdAt;
     [ObservableProperty] private bool _pathExistsOnDisk;
+    /// <summary>Not Merged in ClaudeDo, but the branch's commits are already in the default branch (e.g. a squash PR).</summary>
+    [ObservableProperty] private bool _contentInMain;
     [ObservableProperty] private bool _isSelected;
     [ObservableProperty] private bool _isChecked;
     [ObservableProperty]
@@ -374,6 +376,7 @@ public sealed partial class WorktreesOverviewModalViewModel : ViewModelBase
         ListId = d.ListId, ListName = d.ListName,
         Path = d.Path, BranchName = d.BranchName, BaseCommit = d.BaseCommit, State = d.State,
         DiffStat = d.DiffStat, CreatedAt = d.CreatedAt, PathExistsOnDisk = d.PathExistsOnDisk,
+        ContentInMain = d.ContentInMain,
     };
 
     public IEnumerable<WorktreeOverviewRowViewModel> AllRows =>

src/ClaudeDo.Ui/Views/Modals/WorktreesOverviewModalView.axaml

@@ -77,6 +77,11 @@
               <TextBlock Classes="meta" Text="{loc:Tr modals.worktreesOverview.phantom}" Foreground="{DynamicResource StatusErrorBrush}"
                          IsVisible="{Binding !PathExistsOnDisk}"
                          ToolTip.Tip="{loc:Tr modals.worktreesOverview.phantomTooltip}"/>
+              <TextBlock Classes="meta" Text="•"
+                         IsVisible="{Binding ContentInMain}"/>
+              <TextBlock Classes="meta" Text="{loc:Tr modals.worktreesOverview.mergedExternal}" Foreground="{DynamicResource StatusDoneBrush}"
+                         IsVisible="{Binding ContentInMain}"
+                         ToolTip.Tip="{loc:Tr modals.worktreesOverview.mergedExternalTooltip}"/>
             </StackPanel>
           </StackPanel>
           <TextBlock Grid.Column="2" Classes="meta" VerticalAlignment="Center"

src/ClaudeDo.Worker/External/WorktreeMcpTools.cs

@@ -23,7 +23,7 @@ public sealed record TaskDiffDto(
 
 public sealed record WorktreeListItemDto(
     string? TaskId, int? Number, string Path, string Branch,
-    string HeadCommit, bool IsDirty, bool MergedIntoMain);
+    string HeadCommit, bool IsDirty, bool MergedIntoMain, bool ContentInMain = false);
 
 public sealed record CleanupWorktreeResult(
     bool Removed, string WorktreePath, bool BranchDeleted, int? Number = null);
@@ -152,27 +152,31 @@ public sealed class WorktreeMcpTools
 
     [McpServerTool, Description(
         "Survey every worktree ClaudeDo tracks — use it to find leftovers to clean up. Only worktrees recorded in " +
-        "the ClaudeDo database appear here, and headCommit is empty when the path is missing from disk." +
+        "the ClaudeDo database appear here, and headCommit is empty when the path is missing from disk or is not a " +
+        "git worktree. contentInMain: the branch's own commits are already in the default branch (merged, " +
+        "fast-forwarded or squash-merged outside ClaudeDo), checked against the LOCAL origin/<default> (else " +
+        "main/master) without fetching -- fetch first for a current answer. mergedIntoMain = merged via ClaudeDo " +
+        "or contentInMain." +
         McpToolDocs.ProgressHint)]
     public async Task<IReadOnlyList<WorktreeListItemDto>> ListWorktrees(
         CancellationToken cancellationToken = default,
         IProgress<ProgressNotificationValue>? progress = null)
     {
         var rows = await _maintenance.GetOverviewAsync(null, cancellationToken);
-        // One git status + one rev-parse per row, run concurrently -- with many tracked worktrees
+        // One git status + one rev-parse per row (on top of GetOverviewAsync's content-in-main check), run concurrently -- with many tracked worktrees
         // (this tool's whole point is surfacing leftovers nobody cleaned up) that can still take a
         // while, so this reports on the same elapsed-time cadence as a single long git call rather
         // than per-row (rows finish out of order under Task.WhenAll, so there's no natural i/n).
         var results = await ProgressReporter.RunAsync(
             Task.WhenAll(rows.Select(async row =>
             {
-                var isDirty = row.PathExistsOnDisk && await TryGetIsDirtyAsync(row.Path, cancellationToken);
-                var headCommit = row.PathExistsOnDisk
+                var isDirty = row.IsGitWorktree && await TryGetIsDirtyAsync(row.Path, cancellationToken);
+                var headCommit = row.IsGitWorktree
                     ? (await TryRunGitAsync(row.Path, ["rev-parse", "HEAD"], cancellationToken) ?? "")
                     : "";
                 return new WorktreeListItemDto(
                     row.TaskId, row.TaskNumber, row.Path, row.BranchName, headCommit,
-                    isDirty, row.State == WorktreeState.Merged);
+                    isDirty, row.State == WorktreeState.Merged || row.ContentInMain, row.ContentInMain);
             })),
             ProgressReportInterval, progress, "surveying worktrees");
         return results;
@@ -180,7 +184,7 @@ public sealed class WorktreeMcpTools
 
     [McpServerTool, Description(
         "Remove a task's worktree directory and delete its git branch. branchDeleted reports whether the branch " +
-        "went too." + McpToolDocs.NotWhileRunning)]
+        "is gone afterwards (also true when it was already deleted)." + McpToolDocs.NotWhileRunning)]
     public async Task<CleanupWorktreeResult> CleanupTaskWorktree(
         string taskId,
         [Description("false (default): refuse a worktree with uncommitted changes. true: remove it anyway, losing " +
@@ -200,7 +204,8 @@ public sealed class WorktreeMcpTools
         if (task.Status == TaskStatus.Running)
             throw new InvalidOperationException("Cannot remove worktree of a running task.");
 
-        if (!force && Directory.Exists(wt.Path))
+        // Only a real checkout can be dirty; git status in an empty leftover dir fails (or walks up into an enclosing repo).
+        if (!force && WorktreeMaintenanceService.IsGitWorktree(wt.Path))
         {
             var isDirty = await ProgressReporter.RunAsync(
                 _git.HasChangesAsync(wt.Path, cancellationToken), ProgressReportInterval, progress, "checking worktree for changes");

src/ClaudeDo.Worker/Hub/WorkerHub.cs

@@ -467,7 +467,7 @@ public sealed class WorkerHub : Microsoft.AspNetCore.SignalR.Hub
         return rows.Select(r => new WorktreeOverviewDto(
             r.TaskId, r.TaskTitle, r.TaskStatus, r.ListId, r.ListName,
             r.Path, r.BranchName, r.BaseCommit, r.State, r.DiffStat, r.CreatedAt, r.PathExistsOnDisk,
-            r.TaskNumber)).ToList();
+            r.TaskNumber, r.ContentInMain)).ToList();
     }
 
     public async Task<bool> SetWorktreeState(string taskId, WorktreeState newState)

src/ClaudeDo.Worker/Worktrees/WorktreeMaintenanceService.cs

@@ -1,3 +1,4 @@
+using System.Collections.Concurrent;
 using ClaudeDo.Data;
 using ClaudeDo.Data.Git;
 using ClaudeDo.Data.Models;
@@ -44,12 +45,28 @@ public sealed class WorktreeMaintenanceService
                     join t in context.Tasks on w.TaskId equals t.Id
                     join l in context.Lists on t.ListId equals l.Id
                     where w.State == WorktreeState.Merged || w.State == WorktreeState.Discarded
-                    select new { Row = new WorktreeRow(w.TaskId, w.Path, w.BranchName, l.WorkingDir), ListId = t.ListId };
+                          || (w.State == WorktreeState.Active && t.Status != ClaudeDo.Data.Models.TaskStatus.Running)
+                    select new
+                    {
+                        Row = new WorktreeRow(w.TaskId, w.Path, w.BranchName, l.WorkingDir),
+                        ListId = t.ListId, w.State, w.BaseCommit,
+                    };
 
         if (!string.IsNullOrEmpty(listId))
             query = query.Where(x => x.ListId == listId);
 
-        var rows = await query.AsNoTracking().Select(x => x.Row).ToListAsync(ct);
+        var candidates = await query.AsNoTracking().ToListAsync(ct);
+        var rows = new List<WorktreeRow>();
+        foreach (var c in candidates)
+        {
+            // An Active row only counts as finished when it was merged outside ClaudeDo (e.g. a
+            // squash PR) and holds nothing uncommitted -- TryRemoveAsync would delete that too.
+            if (c.State != WorktreeState.Active
+                || (IsGitWorktree(c.Row.Path)
+                    && await IsContentInMainAsync(c.Row.Path, c.BaseCommit, ct)
+                    && !await TryHasChangesAsync(c.Row.Path, ct)))
+                rows.Add(c.Row);
+        }
 
         int removed = 0;
         var removedTaskIds = new List<string>();
@@ -114,10 +131,100 @@ public sealed class WorktreeMaintenanceService
 
         var rows = await query.AsNoTracking().ToListAsync(ct);
 
-        return rows.Select(x => new WorktreeOverviewRow(
+        return await Task.WhenAll(rows.Select(async x =>
+        {
+            var isGitWorktree = IsGitWorktree(x.Path);
+            var contentInMain = isGitWorktree
+                && (x.State is WorktreeState.Active or WorktreeState.Kept)
+                && await IsContentInMainAsync(x.Path, x.BaseCommit, ct);
+            return new WorktreeOverviewRow(
                 x.TaskId, x.Number, x.Title, x.Status, x.ListId, x.ListName,
                 x.Path, x.BranchName, x.BaseCommit ?? "", x.State, x.DiffStat, x.CreatedAt,
-            PathExistsOnDisk: !string.IsNullOrWhiteSpace(x.Path) && Directory.Exists(x.Path))).ToList();
+                PathExistsOnDisk: !string.IsNullOrWhiteSpace(x.Path) && Directory.Exists(x.Path),
+                isGitWorktree, contentInMain);
+        }));
+    }
+
+    /// <summary>True when <paramref name="path"/> holds a git checkout (<c>.git</c> file or dir), not just a directory.</summary>
+    // A bare directory check isn't enough: git walks up from an empty dir into whatever repo encloses it.
+    internal static bool IsGitWorktree(string? path) =>
+        !string.IsNullOrWhiteSpace(path)
+        && (File.Exists(Path.Combine(path, ".git")) || Directory.Exists(Path.Combine(path, ".git")));
+
+    // ponytail: 30s TTL per path -- the overview modal reloads every 4s and this costs ~5 git
+    // processes per row; key on (path, HEAD, target sha) if a stale answer ever matters.
+    private static readonly TimeSpan ContentInMainTtl = TimeSpan.FromSeconds(30);
+    private readonly ConcurrentDictionary<string, (DateTime At, bool Result)> _contentInMainCache = new();
+
+    /// <summary>
+    /// The worktree's own commits are already in the default branch -- HEAD is an ancestor of it, or
+    /// merging HEAD would not change its tree (squash PR). Checks local refs only, never fetches.
+    /// </summary>
+    private async Task<bool> IsContentInMainAsync(string path, string? baseCommit, CancellationToken ct)
+    {
+        if (string.IsNullOrWhiteSpace(baseCommit)) return false;
+        if (_contentInMainCache.TryGetValue(path, out var hit) && DateTime.UtcNow - hit.At < ContentInMainTtl)
+            return hit.Result;
+
+        bool result;
+        try
+        {
+            // No commits beyond the base: trivially "in main", but there is nothing merged.
+            if (await _git.IsAncestorAsync(path, "HEAD", baseCommit, ct) != false) result = false;
+            else if (await ResolveDefaultRefAsync(path, ct) is not { } target) result = false;
+            else if (await _git.IsAncestorAsync(path, "HEAD", target, ct) == true) result = true;
+            else
+            {
+                var preview = await _git.PreviewMergeAsync(path, target, "HEAD", ct);
+                result = preview.Clean
+                         && preview.TreeOid == await _git.RevParseAsync(path, $"{target}^{{tree}}", ct);
+            }
+        }
+        catch (OperationCanceledException) { throw; }
+        catch (Exception ex)
+        {
+            _logger.LogDebug(ex, "content-in-main check failed for {Path}", path);
+            result = false;
+        }
+
+        _contentInMainCache[path] = (DateTime.UtcNow, result);
+        return result;
+    }
+
+    /// <summary>origin/HEAD's branch, else the first existing of origin/main, origin/master, main, master.</summary>
+    private async Task<string?> ResolveDefaultRefAsync(string dir, CancellationToken ct)
+    {
+        var remoteHead = await _git.GetRemoteHeadBranchAsync(dir, ct);
+        string[] candidates = remoteHead is null
+            ? ["origin/main", "origin/master", "main", "master"]
+            : [$"origin/{remoteHead}"];
+        foreach (var c in candidates)
+        {
+            try { await _git.RevParseAsync(dir, $"{c}^{{commit}}", ct); return c; }
+            catch (InvalidOperationException) { }
+        }
+        return null;
+    }
+
+    private async Task<bool> TryHasChangesAsync(string path, CancellationToken ct)
+    {
+        // Can't tell -> treat as dirty, so a bulk cleanup never deletes it.
+        try { return await _git.HasChangesAsync(path, ct); }
+        catch (OperationCanceledException) { throw; }
+        catch { return true; }
+    }
+
+    /// <summary>The repo owning the worktree (parent of its git-common-dir); the list's working dir when the path is no git checkout anymore.</summary>
+    private async Task<string?> ResolveOwnerRepoAsync(WorktreeRow row, CancellationToken ct)
+    {
+        if (!IsGitWorktree(row.Path)) return row.WorkingDir;
+        var commonDir = await _git.GetCommonDirAsync(row.Path, ct);
+        if (commonDir is null) return row.WorkingDir;
+        var full = Path.TrimEndingDirectorySeparator(Path.GetFullPath(commonDir));
+        // Non-bare repo: .../<repo>/.git -> <repo>. A bare repo's common dir is the repo itself.
+        return Path.GetFileName(full).Equals(".git", StringComparison.OrdinalIgnoreCase)
+            ? Path.GetDirectoryName(full)
+            : full;
     }
 
     public async Task<ForceRemoveResult> ForceRemoveAsync(string taskId, CancellationToken ct = default)
@@ -145,7 +252,10 @@ public sealed class WorktreeMaintenanceService
 
     private async Task<(bool Removed, bool BranchDeleted)> TryRemoveAsync(WorktreeRow row, bool force, CancellationToken ct)
     {
-        var repoDirExists = !string.IsNullOrWhiteSpace(row.WorkingDir) && Directory.Exists(row.WorkingDir);
+        // The list's working dir isn't necessarily the repo that owns the worktree (a list can point
+        // at another repo than the task ran in) -- prune/branch -D there would silently miss.
+        var repoDir = await ResolveOwnerRepoAsync(row, ct);
+        var repoDirExists = !string.IsNullOrWhiteSpace(repoDir) && Directory.Exists(repoDir);
         bool dirRemoved;
 
         if (repoDirExists)
@@ -153,7 +263,7 @@ public sealed class WorktreeMaintenanceService
             dirRemoved = true;
             try
             {
-                await _git.WorktreeRemoveAsync(row.WorkingDir!, row.Path, force, ct);
+                await _git.WorktreeRemoveAsync(repoDir!, row.Path, force, ct);
             }
             catch (Exception ex)
             {
@@ -195,21 +305,24 @@ public sealed class WorktreeMaintenanceService
         bool branchDeleted = false;
         if (repoDirExists)
         {
-            try { await _git.WorktreePruneAsync(row.WorkingDir!, ct); }
-            catch (Exception ex) { _logger.LogWarning(ex, "git worktree prune failed for {Repo}", row.WorkingDir); }
+            try { await _git.WorktreePruneAsync(repoDir!, ct); }
+            catch (Exception ex) { _logger.LogWarning(ex, "git worktree prune failed for {Repo}", repoDir); }
 
             if (!string.IsNullOrWhiteSpace(row.BranchName))
             {
                 try
                 {
-                    await _git.BranchDeleteAsync(row.WorkingDir!, row.BranchName, force: true, ct);
+                    await _git.BranchDeleteAsync(repoDir!, row.BranchName, force: true, ct);
                     branchDeleted = true;
                 }
                 catch (Exception ex)
                 {
                     // Already deleted -- the normal case once the branch has been merged.
                     if (IsBranchAlreadyGone(ex))
+                    {
                         _logger.LogDebug(ex, "branch {Branch} was already deleted", row.BranchName);
+                        branchDeleted = true;
+                    }
                     else
                         _logger.LogWarning(ex, "Failed to delete branch {Branch} for worktree {Path}",
                             row.BranchName, row.Path);

src/ClaudeDo.Worker/Worktrees/WorktreeOverviewRow.cs

@@ -3,6 +3,9 @@ using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
 
 namespace ClaudeDo.Worker.Worktrees;
 
+/// <summary>One tracked worktree with its task/list context and on-disk facts.</summary>
+/// <param name="IsGitWorktree">The path holds a git checkout (<c>.git</c> present), not just a directory.</param>
+/// <param name="ContentInMain">Own commits are already in the local default branch (merged, fast-forwarded or squashed) — independent of <paramref name="State"/>.</param>
 public sealed record WorktreeOverviewRow(
     string TaskId,
     int TaskNumber,
@@ -16,4 +19,6 @@ public sealed record WorktreeOverviewRow(
     WorktreeState State,
     string? DiffStat,
     DateTime CreatedAt,
-    bool PathExistsOnDisk);
+    bool PathExistsOnDisk,
+    bool IsGitWorktree = false,
+    bool ContentInMain = false);

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

@@ -489,4 +489,45 @@ public sealed class WorktreeMcpToolsTests : IDisposable
             WorktreeMcpTools.ProgressReportInterval = original;
         }
     }
+
+    [Fact]
+    public async Task CleanupTaskWorktree_EmptyDirectory_RemovesDbRow()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var (task, list, wt) = await SeedWorktreeAsync(TaskStatus.Done);
+        // Leave an empty, non-git directory behind where the worktree was.
+        GitRepoFixture.RunGit(list.WorkingDir!, "worktree", "remove", "--force", wt.WorktreePath);
+        Directory.CreateDirectory(wt.WorktreePath);
+        var sut = BuildSut(CreateQueue());
+
+        var rows = await sut.ListWorktrees(CancellationToken.None);
+        Assert.Equal("", rows.Single(r => r.TaskId == task.Id).HeadCommit);
+
+        var result = await sut.CleanupTaskWorktree(task.Id, false, CancellationToken.None);
+
+        Assert.True(result.Removed);
+        Assert.False(Directory.Exists(wt.WorktreePath));
+        using var ctx = _db.CreateContext();
+        Assert.Null(await new WorktreeRepository(ctx).GetByTaskIdAsync(task.Id));
+    }
+
+    [Fact]
+    public async Task ListWorktrees_SquashMergedBranch_ReportsMergedIntoMain()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var (task, list, wt) = await SeedWorktreeAsync(TaskStatus.Done);
+        File.WriteAllText(Path.Combine(wt.WorktreePath, "feature.txt"), "x");
+        GitRepoFixture.RunGit(wt.WorktreePath, "add", "-A");
+        GitRepoFixture.RunGit(wt.WorktreePath, "commit", "-m", "feature");
+        GitRepoFixture.RunGit(list.WorkingDir!, "merge", "--squash", wt.BranchName);
+        GitRepoFixture.RunGit(list.WorkingDir!, "commit", "-m", "squash");
+        var sut = BuildSut(CreateQueue());
+
+        var row = (await sut.ListWorktrees(CancellationToken.None)).Single(r => r.TaskId == task.Id);
+
+        Assert.True(row.ContentInMain);
+        Assert.True(row.MergedIntoMain);
+    }
 }

tests/ClaudeDo.Worker.Tests/Services/WorktreeMaintenanceServiceTests.cs

@@ -531,4 +531,131 @@ public class WorktreeMaintenanceServiceTests : IDisposable
         Assert.Equal(1, progressCalls[0].Args[2]);
         Assert.Equal(2, progressCalls[1].Args[2]);
     }
+
+    private static async Task SeedRowAsync(DbFixture db, ListEntity? list, TaskEntity task, string path, string branch,
+        string baseCommit, WorktreeState state = WorktreeState.Active)
+    {
+        using var ctx = db.CreateContext();
+        if (list is not null) await new ListRepository(ctx).AddAsync(list);
+        await new TaskRepository(ctx).AddAsync(task);
+        await new WorktreeRepository(ctx).AddAsync(new WorktreeEntity
+        {
+            TaskId = task.Id, Path = path, BranchName = branch,
+            BaseCommit = baseCommit, State = state, CreatedAt = DateTime.UtcNow,
+        });
+    }
+
+    private static void CommitFile(string dir, string file)
+    {
+        File.WriteAllText(Path.Combine(dir, file), file);
+        GitRepoFixture.RunGit(dir, "add", "-A");
+        GitRepoFixture.RunGit(dir, "commit", "-m", $"add {file}");
+    }
+
+    private static void SquashMerge(string repoDir, string branch)
+    {
+        GitRepoFixture.RunGit(repoDir, "merge", "--squash", branch);
+        GitRepoFixture.RunGit(repoDir, "commit", "-m", $"squash {branch}");
+    }
+
+    [Fact]
+    public async Task GetOverview_ContentInMain_True_For_SquashMerged_False_For_Unmerged_Commit()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = NewRepo();
+        var git = new GitService();
+        var db = NewDb();
+        var (list, squashed) = MakeEntities(repo.RepoDir);
+        var unmerged = MakeTaskForList(list.Id, ClaudeDo.Data.Models.TaskStatus.Done);
+
+        var squashedWt = await CreateWorktreeAsync(git, repo.RepoDir, squashed.Id);
+        var unmergedWt = await CreateWorktreeAsync(git, repo.RepoDir, unmerged.Id);
+        CommitFile(squashedWt, "squashed.txt");
+        CommitFile(unmergedWt, "unmerged.txt");
+        SquashMerge(repo.RepoDir, $"test/{squashed.Id}");
+
+        await SeedRowAsync(db, list, squashed, squashedWt, $"test/{squashed.Id}", repo.BaseCommit);
+        await SeedRowAsync(db, null, unmerged, unmergedWt, $"test/{unmerged.Id}", repo.BaseCommit);
+
+        var svc = new WorktreeMaintenanceService(db.CreateFactory(), git, NullLogger<WorktreeMaintenanceService>.Instance);
+        var rows = await svc.GetOverviewAsync(null);
+
+        Assert.True(rows.Single(r => r.TaskId == squashed.Id).ContentInMain);
+        Assert.False(rows.Single(r => r.TaskId == unmerged.Id).ContentInMain);
+
+        try { await git.WorktreeRemoveAsync(repo.RepoDir, squashedWt, force: true); } catch { }
+        try { await git.WorktreeRemoveAsync(repo.RepoDir, unmergedWt, force: true); } catch { }
+    }
+
+    [Fact]
+    public async Task CleanupFinished_Removes_Active_Worktree_Squash_Merged_Outside_ClaudeDo()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = NewRepo();
+        var git = new GitService();
+        var db = NewDb();
+        var (list, squashed) = MakeEntities(repo.RepoDir);
+        var unmerged = MakeTaskForList(list.Id, ClaudeDo.Data.Models.TaskStatus.Done);
+
+        var squashedWt = await CreateWorktreeAsync(git, repo.RepoDir, squashed.Id);
+        var unmergedWt = await CreateWorktreeAsync(git, repo.RepoDir, unmerged.Id);
+        CommitFile(squashedWt, "squashed.txt");
+        CommitFile(unmergedWt, "unmerged.txt");
+        SquashMerge(repo.RepoDir, $"test/{squashed.Id}");
+
+        await SeedRowAsync(db, list, squashed, squashedWt, $"test/{squashed.Id}", repo.BaseCommit);
+        await SeedRowAsync(db, null, unmerged, unmergedWt, $"test/{unmerged.Id}", repo.BaseCommit);
+
+        var svc = new WorktreeMaintenanceService(db.CreateFactory(), git, NullLogger<WorktreeMaintenanceService>.Instance);
+        var result = await svc.CleanupFinishedAsync();
+
+        Assert.Equal(new[] { squashed.Id }, result.RemovedTaskIds);
+        Assert.False(Directory.Exists(squashedWt));
+        Assert.True(Directory.Exists(unmergedWt));
+
+        try { await git.WorktreeRemoveAsync(repo.RepoDir, unmergedWt, force: true); } catch { }
+    }
+
+    [Fact]
+    public async Task ForceRemove_Prunes_And_Deletes_Branch_In_Owning_Repo_Not_List_WorkingDir()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var owner = NewRepo();
+        var other = NewRepo();
+        var git = new GitService();
+        var db = NewDb();
+        // The list points at a different repo than the one the worktree was created in.
+        var (list, task) = MakeEntities(other.RepoDir);
+        var wt = await CreateWorktreeAsync(git, owner.RepoDir, task.Id);
+        await SeedRowAsync(db, list, task, wt, $"test/{task.Id}", owner.BaseCommit);
+
+        var svc = new WorktreeMaintenanceService(db.CreateFactory(), git, NullLogger<WorktreeMaintenanceService>.Instance);
+        var result = await svc.ForceRemoveAsync(task.Id);
+
+        Assert.True(result.Removed);
+        Assert.True(result.BranchDeleted);
+        Assert.DoesNotContain($"test/{task.Id}", GitRepoFixture.RunGit(owner.RepoDir, "branch", "--list"));
+        Assert.DoesNotContain(Path.GetFileName(wt), GitRepoFixture.RunGit(owner.RepoDir, "worktree", "list"));
+    }
+
+    [Fact]
+    public async Task ForceRemove_Reports_BranchDeleted_When_Branch_Was_Already_Gone()
+    {
+        if (!GitAvailable) { Assert.True(true, "git not available -- skipping"); return; }
+
+        var repo = NewRepo();
+        var db = NewDb();
+        var (list, task) = MakeEntities(repo.RepoDir);
+        var phantomPath = Path.Combine(Path.GetTempPath(), $"wt_phantom_{Guid.NewGuid():N}");
+        await SeedRowAsync(db, list, task, phantomPath, $"test/{task.Id}-never-existed", repo.BaseCommit);
+
+        var svc = new WorktreeMaintenanceService(db.CreateFactory(), new GitService(), NullLogger<WorktreeMaintenanceService>.Instance);
+        var result = await svc.ForceRemoveAsync(task.Id);
+
+        Assert.True(result.Removed);
+        Assert.True(result.BranchDeleted);
+    }
 }