feat(context): Integrate view modes into aggregate pipeline

tests/test_context_composition_decoupled.py

@@ -1,4 +1,5 @@
 import pytest
+from pathlib import Path
 from src.app_controller import AppController
 from src.models import FileItem
 
@@ -35,7 +36,7 @@ def test_do_generate_uses_context_files(monkeypatch):
     
     def mock_aggregate_run(flat, **kwargs):
         assert flat["files"]["paths"] == controller.context_files
-        return ("md", "path", [], "stable_md", "disc_text")
+        return ("md", Path("path"), [])
         
     monkeypatch.setattr(pm, "flat_config", mock_flat_config)
     monkeypatch.setattr(pm, "save_project", lambda *args: None)