feat(lea): add dashboard competence promotion dry run

tests/unit/test_lea_competence_verdict_api.py

@@ -107,3 +107,42 @@ def test_list_competence_verdicts_endpoint(monkeypatch):
     assert data["verdicts"] == [
         {"competence_id": "key_win_r_wait_explorer_exe", "verdict_kind": "valid"}
     ]
+
+
+def test_promote_competence_endpoint_dry_run(monkeypatch):
+    def fake_promote(competence_id, payload):
+        assert competence_id == "key_win_r_wait_explorer_exe"
+        assert payload["dry_run"] is True
+        return {
+            "promotion_id": payload["promotion_id"],
+            "competence_id": competence_id,
+            "target_state": "candidate",
+            "dry_run": True,
+            "eligible": True,
+            "dry_run_token": "token",
+            "write_applied": False,
+        }
+
+    monkeypatch.setattr(
+        lea_competences_module,
+        "promote_competence_from_verdicts",
+        fake_promote,
+    )
+
+    with _app().test_client() as client:
+        response = client.post(
+            "/api/v1/lea/competences/key_win_r_wait_explorer_exe/promote",
+            json={
+                "promotion_id": "123e4567-e89b-42d3-a456-426614174000",
+                "target_state": "candidate",
+                "verdict_ids": ["123e4567-e89b-42d3-a456-426614174001"],
+                "confirmed_by": "human:dom",
+                "dry_run": True,
+            },
+        )
+
+    data = response.get_json()
+    assert response.status_code == 200
+    assert data["success"] is True
+    assert data["dry_run"] is True
+    assert data["yaml_write"] is False