Merge branch 'claudedo/5c80a0aba5d9468a96cf809fc7a6e7a1'

src/ClaudeDo.Data/Git/GitService.cs

@@ -478,6 +478,21 @@ public sealed class GitService
             .Count(s => s.Length > 0);
     }
 
+    /// <summary>Files that differ between two exact refs (2-dot, no merge-base resolution) -- used to see
+    /// what a target branch itself picked up since a task's fork point, as opposed to
+    /// <see cref="CountChangedFilesAsync"/>'s 3-dot count of a branch's own changes.</summary>
+    public async Task<IReadOnlyList<string>> GetChangedFileNamesAsync(
+        string repoDir, string fromRef, string toRef, CancellationToken ct = default)
+    {
+        var (exitCode, stdout, _) = await RunGitAsync(repoDir,
+            ["diff", "--name-only", $"{fromRef}..{toRef}"], ct);
+        if (exitCode != 0) return Array.Empty<string>();
+        return stdout
+            .Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
+            .Where(s => s.Length > 0)
+            .ToList();
+    }
+
     private static async Task<(int ExitCode, string Stdout, string Stderr)> RunGitAsync(
         string workDir, IEnumerable<string> args, CancellationToken ct, string? stdinData = null, bool trimOutput = true)
     {