Do not make the ingest folder

A folder that Bindery made hid a missing volume mount. The books went
to a folder inside the container, and CWA never saw them. A missing
folder is now an error in the log at the start, and each upload fails
with a message that names the mount.

tests/test_optional_cwa.py

@@ -21,6 +21,7 @@ from bindery.store import Store
 @pytest.fixture(autouse=True)
 def isolated(client, jobs, monkeypatch, tmp_path):
     monkeypatch.setattr(config, "INGEST_DIR", tmp_path / "ingest")
+    config.INGEST_DIR.mkdir()
     monkeypatch.setattr(config, "TMP_DIR", tmp_path / "tmp")
     config.TMP_DIR.mkdir()
     monkeypatch.setattr(config, "CWA_URL", "")
@@ -151,7 +152,7 @@ def test_build_without_ingest_succeeds_and_keeps_the_book_local(monkeypatch, tmp
     assert story["status"] == "ok"
     assert story["ingested_at"] == ("2026-01-01" if existing else None)
     assert list(config.TMP_DIR.glob(f"story-{story_id}-*.epub"))
-    assert not (tmp_path / "ingest").exists()
+    assert not list((tmp_path / "ingest").iterdir())
     details = orchestrator.story_details(story_id)
     assert details["uploads_paused"] is True
     assert details["story"]["upload_held"] is True
@@ -184,7 +185,7 @@ def test_linking_off_exports_books_and_respects_pause(monkeypatch, tmp_path, con
         assert orchestrator.store.get_setting(story_id, "upload_held") is None
     else:
         assert message.startswith("Not sent.")
-        assert not config.INGEST_DIR.exists()
+        assert not list(config.INGEST_DIR.iterdir())
         assert orchestrator.store.get_setting(story_id, "upload_held") is True
 
 
@@ -221,7 +222,7 @@ def test_enabling_linking_restores_the_saved_approval_preference(library):
     assert orchestrator.get_settings()["hold_new_links"] is True
     assert orchestrator.story_details(story_id)["story"]["needs_approval"] is True
     assert "Approve link" in rebuild(story_id)
-    assert not config.INGEST_DIR.exists()
+    assert not list(config.INGEST_DIR.iterdir())
 
 
 def test_linking_off_exports_every_rebuild_without_an_id_or_approval():
@@ -294,7 +295,7 @@ def test_paused_unlinked_update_does_not_raise_not_found(monkeypatch):
     story_id = add_story(ingested_at="2026-01-01")
     assert rebuild(story_id) == "Not sent. Turn off pause to send."
     assert orchestrator.store.get_story(story_id)["status"] == "ok"
-    assert not config.INGEST_DIR.exists()
+    assert not list(config.INGEST_DIR.iterdir())
 
 
 def test_enabling_linking_rebuilds_held_books_and_matches_again(monkeypatch, jobs, tmp_path):
@@ -335,7 +336,7 @@ def test_upload_settings_matrix(client, link_books, hold_new_links, paused, save
     assert listed["upload_held"] is pending
     assert listed["approval_held"] is (link_books and hold_new_links and not paused)
     assert bool(orchestrator.store.get_setting(story_id, "upload_held")) is pending
-    assert config.INGEST_DIR.exists() is (not pending)
+    assert bool(list(config.INGEST_DIR.iterdir())) is (not pending)
 
 
 @pytest.mark.parametrize("missing_ingest", [False, True])
@@ -376,7 +377,7 @@ def test_resuming_uploads_does_not_bypass_approval(client, jobs, library):
     assert client.get("/api/stories").json[0]["approval_held"] is True
     assert "Approve link" in orchestrator._run_rebuild(jobs.get_next())
     assert orchestrator.store.get_setting(story_id, "upload_held") is True
-    assert not config.INGEST_DIR.exists()
+    assert not list(config.INGEST_DIR.iterdir())
 
 
 def test_missing_library_connection_is_not_an_approval_hold(client, monkeypatch):