feat(vwb): harden supervised verdict evidence

tests/unit/test_competence_to_vwb_preview.py

@@ -111,3 +111,39 @@ def test_preview_endpoint_returns_read_only_workflow():
         "wait_for_state",
         "pause_for_human",
     ]
+
+
+def test_unsupported_method_is_reported_as_warning(tmp_path):
+    root = tmp_path / "competences"
+    candidate = root / "candidate"
+    candidate.mkdir(parents=True)
+    (candidate / "unsupported_preview.yaml").write_text(
+        "\n".join(
+            [
+                "schema_version: 1",
+                "id: unsupported_preview",
+                "name: Unsupported preview",
+                "learning_state: candidate",
+                "intent:",
+                "  fr: tester une methode non supportee",
+                "methods:",
+                "- id: step_1_unknown",
+                "  kind: shell_magic",
+                "  primitive_ref: shell_magic",
+                "  parameters: {}",
+                "failure_message_template:",
+                "  attendu: aucun replay automatique",
+            ]
+        ),
+        encoding="utf-8",
+    )
+
+    preview = competence_yaml_to_vwb_preview("unsupported_preview", root=root)
+
+    assert [step["action_type"] for step in preview["steps"]] == [
+        "pause_for_human",
+        "pause_for_human",
+    ]
+    assert preview["warnings"] == [
+        "Methode non supportee en preview VWB: step_1_unknown"
+    ]