docs(xrechnung): complete German reference contract

tests/test_documentation.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from govoplan_core.core.modules import documentation_structured_translation_issues
+from govoplan_xrechnung.backend.manifest import manifest
+
+
+def test_xrechnung_german_workflow_and_reference_are_complete() -> None:
+    topics = {topic.id: topic for topic in manifest.documentation}
+    assert len(topics) == 2
+    assert topics["xrechnung.inbound-validation"].metadata["kind"] == "workflow"
+    assert topics["xrechnung.reference.validation-profile-and-handoff"].metadata["kind"] == "reference"
+    for topic in topics.values():
+        assert all(topic.translations["de"].get(key) for key in ("title", "summary", "body"))
+        assert topic.structured_translation_version == "1"
+        assert "de" in topic.structured_translations
+        assert documentation_structured_translation_issues(topic) == ()