feat(git): add ListConflictedFilesAsync

src/ClaudeDo.Data/Git/GitService.cs

@@ -198,6 +198,19 @@ public sealed class GitService
             throw new InvalidOperationException($"git merge --abort failed (exit {exitCode}): {stderr}");
     }
 
+    public async Task<List<string>> ListConflictedFilesAsync(string repoDir, CancellationToken ct = default)
+    {
+        var (exitCode, stdout, stderr) = await RunGitAsync(repoDir,
+            ["diff", "--name-only", "--diff-filter=U"], ct);
+        if (exitCode != 0)
+            throw new InvalidOperationException($"git diff --diff-filter=U failed (exit {exitCode}): {stderr}");
+
+        return stdout
+            .Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
+            .Where(s => s.Length > 0)
+            .ToList();
+    }
+
     public async Task MergeFfOnlyAsync(string repoDir, string branchName, CancellationToken ct = default)
     {
         var (exitCode, _, stderr) = await RunGitAsync(repoDir, ["merge", "--ff-only", branchName], ct);

tests/ClaudeDo.Worker.Tests/Runner/GitServiceMergeTests.cs

@@ -154,4 +154,30 @@ public class GitServiceMergeTests : IDisposable
         await git.MergeAbortAsync(repo.RepoDir);
         Assert.False(await git.IsMidMergeAsync(repo.RepoDir));
     }
+
+    [Fact]
+    public async Task ListConflictedFilesAsync_MidConflict_ReturnsConflictedFile()
+    {
+        if (!GitRepoFixture.IsGitAvailable()) return;
+        var repo = NewRepo();
+
+        GitRepoFixture.RunGit(repo.RepoDir, "checkout", "-b", "feature/cflist");
+        File.WriteAllText(Path.Combine(repo.RepoDir, "README.md"), "# feat\n");
+        GitRepoFixture.RunGit(repo.RepoDir, "add", "-A");
+        GitRepoFixture.RunGit(repo.RepoDir, "commit", "-m", "edit");
+
+        try { GitRepoFixture.RunGit(repo.RepoDir, "checkout", "main"); }
+        catch { GitRepoFixture.RunGit(repo.RepoDir, "checkout", "master"); }
+        File.WriteAllText(Path.Combine(repo.RepoDir, "README.md"), "# main\n");
+        GitRepoFixture.RunGit(repo.RepoDir, "add", "-A");
+        GitRepoFixture.RunGit(repo.RepoDir, "commit", "-m", "edit");
+
+        var git = new GitService();
+        await git.MergeNoFfAsync(repo.RepoDir, "feature/cflist", "merge");
+
+        var files = await git.ListConflictedFilesAsync(repo.RepoDir);
+        Assert.Contains("README.md", files);
+
+        await git.MergeAbortAsync(repo.RepoDir);
+    }
 }