feat: unify formal Word export

.gitignore

@@ -90,6 +90,8 @@ hermes-agent-main/
 offline-backend-20260512/backend/tests/*
 !offline-backend-20260512/backend/tests/test_llmwiki_weknora.py
 !offline-backend-20260512/backend/tests/test_health_auth_bypass.py
+# Keep formal Word OOXML and embedded-font regression coverage versioned.
+!offline-backend-20260512/backend/tests/test_word_export.py
 # Keep the model configuration regression coverage versioned even though
 # this deployment repository otherwise ignores newly added backend tests.
 !offline-backend-20260512/backend/tests/test_model_management.py