fix(cli): exposer les executions degradees

tests/e2e/test_cli.py

@@ -52,10 +52,10 @@ def test_main_runs_composition_root_in_dry_run_with_requested_log_level(
     runner.run.assert_called_once_with()
 
 
-def test_main_preserves_configured_dry_run_and_returns_success_with_warnings(
+def test_main_preserves_configured_dry_run_and_returns_degraded_with_warnings(
     mocker: MockerFixture,
 ) -> None:
-    """Sans option, la CLI préserve le dry-run configuré et accepte les avertissements."""
+    """Sans option, la CLI préserve le dry-run configuré et signale l'état dégradé."""
     from pronote_sync.cli.main import main
 
     settings = Settings(app=AppSettings(dry_run=True, log_level="WARNING"))
@@ -72,12 +72,32 @@ def test_main_preserves_configured_dry_run_and_returns_success_with_warnings(
 
     exit_code = main([])
 
-    assert exit_code == 0
+    assert exit_code == 2
     assert setup_logging.call_args_list == [mocker.call("INFO"), mocker.call("WARNING")]
     composition_root.assert_called_once_with(settings, dry_run=None)
     runner.run.assert_called_once_with()
 
 
+@pytest.mark.parametrize("step", ["caldav_sync", "send"])
+def test_main_returns_degraded_code_for_caldav_or_xmpp_failure(
+    mocker: MockerFixture,
+    step: str,
+) -> None:
+    """Les échecs récupérables CalDAV et XMPP sont observables par le code 2."""
+    from pronote_sync.cli.main import main
+
+    settings = Settings()
+    mocker.patch("pronote_sync.cli.main.load_settings", return_value=settings)
+    runner = mocker.Mock()
+    runner.run.return_value = (
+        mocker.Mock(spec=PronoteData),
+        [PipelineWarning(f"Échec récupérable de {step}", step=step)],
+    )
+    mocker.patch("pronote_sync.cli.main.PipelineRunner.from_settings", return_value=runner)
+
+    assert main([]) == 2
+
+
 def test_main_returns_failure_and_redacts_pipeline_secrets_at_debug_level(
     mocker: MockerFixture,
     capsys: pytest.CaptureFixture[str],