feat(worker): add PlanningMergeOrchestrator.ContinueAsync to resume merge after conflict

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

src/ClaudeDo.Worker/Planning/PlanningMergeOrchestrator.cs

@@ -64,6 +64,24 @@ public sealed class PlanningMergeOrchestrator
         await DrainAsync(planningTaskId, ct);
     }
 
+    public async Task ContinueAsync(string planningTaskId, CancellationToken ct)
+    {
+        if (!_states.TryGetValue(planningTaskId, out var state) || state.CurrentSubtaskId is null)
+            throw new InvalidOperationException("no in-progress merge to continue");
+
+        var current = state.CurrentSubtaskId;
+        var result = await _merge.ContinueMergeAsync(current, ct);
+        if (result.Status != TaskMergeService.StatusMerged)
+        {
+            await _broadcaster.PlanningMergeConflict(planningTaskId, current, result.ConflictFiles);
+            return;
+        }
+        await _broadcaster.PlanningSubtaskMerged(planningTaskId, current);
+
+        state.CurrentSubtaskId = null;
+        await DrainAsync(planningTaskId, ct);
+    }
+
     private async Task DrainAsync(string planningTaskId, CancellationToken ct)
     {
         if (!_states.TryGetValue(planningTaskId, out var state)) return;

tests/ClaudeDo.Worker.Tests/Planning/PlanningMergeOrchestratorTests.cs

@@ -125,6 +125,73 @@ public sealed class PlanningMergeOrchestratorTests : IDisposable
         return (parentId, subA, subB);
     }
 
+    [Fact]
+    public async Task ContinueAsync_AfterConflict_ResumesRemainingMergesAndCompletes()
+    {
+        var db = NewDb();
+        var repo = NewRepo();
+        GitRepoFixture.RunGit(repo.RepoDir, "branch", "-m", "main");
+
+        var (parentId, subA, subB, subC) = await SeedPlanningThreeChildrenMiddleConflictsAsync(db, repo);
+
+        var (orch, spy) = BuildOrchestrator(db);
+        await orch.StartAsync(parentId, "main", CancellationToken.None);
+
+        Assert.Contains(spy, c => c.Method == "PlanningSubtaskMerged" && (string)c.Args[1]! == subA);
+        Assert.Contains(spy, c => c.Method == "PlanningMergeConflict" && (string)c.Args[1]! == subB);
+
+        File.WriteAllText(Path.Combine(repo.RepoDir, "README.md"), "resolved\n");
+
+        await orch.ContinueAsync(parentId, CancellationToken.None);
+
+        using var ctx = db.CreateContext();
+        Assert.Equal(TaskStatus.Done, ctx.Tasks.Single(t => t.Id == parentId).Status);
+        Assert.Equal(WorktreeState.Merged, ctx.Worktrees.Single(w => w.TaskId == subB).State);
+        Assert.Equal(WorktreeState.Merged, ctx.Worktrees.Single(w => w.TaskId == subC).State);
+        Assert.Contains(spy, c => c.Method == "PlanningSubtaskMerged" && (string)c.Args[1]! == subB);
+        Assert.Contains(spy, c => c.Method == "PlanningSubtaskMerged" && (string)c.Args[1]! == subC);
+        Assert.Contains(spy, c => c.Method == "PlanningCompleted");
+    }
+
+    private async Task<(string parentId, string subA, string subB, string subC)> SeedPlanningThreeChildrenMiddleConflictsAsync(
+        DbFixture db, GitRepoFixture repo)
+    {
+        File.WriteAllText(Path.Combine(repo.RepoDir, "README.md"), "# main change\n");
+        GitRepoFixture.RunGit(repo.RepoDir, "commit", "-am", "main change README");
+
+        using var ctx = db.CreateContext();
+        var listId = Guid.NewGuid().ToString();
+        ctx.Lists.Add(new ListEntity
+        {
+            Id = listId, Name = "test", CreatedAt = DateTime.UtcNow, WorkingDir = repo.RepoDir,
+        });
+        var parentId = Guid.NewGuid().ToString();
+        ctx.Tasks.Add(new TaskEntity
+        {
+            Id = parentId, ListId = listId, Title = "plan", CreatedAt = DateTime.UtcNow,
+            Status = TaskStatus.Planned, SortOrder = 0,
+        });
+        var subA = Guid.NewGuid().ToString();
+        var subB = Guid.NewGuid().ToString();
+        var subC = Guid.NewGuid().ToString();
+        ctx.Tasks.AddRange(
+            new TaskEntity { Id = subA, ListId = listId, Title = "A", CreatedAt = DateTime.UtcNow, ParentTaskId = parentId, Status = TaskStatus.Done, SortOrder = 1 },
+            new TaskEntity { Id = subB, ListId = listId, Title = "B", CreatedAt = DateTime.UtcNow, ParentTaskId = parentId, Status = TaskStatus.Done, SortOrder = 2 },
+            new TaskEntity { Id = subC, ListId = listId, Title = "C", CreatedAt = DateTime.UtcNow, ParentTaskId = parentId, Status = TaskStatus.Done, SortOrder = 3 }
+        );
+        await ctx.SaveChangesAsync();
+
+        SeedWorktreeWithFile(ctx, repo, subA, "fileA.txt", "A\n");
+        SeedWorktreeWithFile(ctx, repo, subB, "README.md", "branch change\n");
+        SeedWorktreeWithFile(ctx, repo, subC, "fileC.txt", "C\n");
+        await ctx.SaveChangesAsync();
+
+        return (parentId, subA, subB, subC);
+    }
+
+    private void SeedWorktreeWithFile(ClaudeDoDbContext ctx, GitRepoFixture repo, string taskId, string filename, string content)
+        => SeedWorktree(ctx, repo, taskId, filename, content);
+
     private void SeedWorktree(ClaudeDoDbContext ctx, GitRepoFixture repo, string taskId, string filename, string content)
     {
         var wtPath = Path.Combine(Path.GetTempPath(), $"wt_{Guid.NewGuid():N}");