feat(ai): add tenant-safe hierarchical expense learning

server/tests/test_user_agent_application_draft_events.py

@@ -159,6 +159,42 @@ def test_untrusted_application_path_does_not_write_learning_ledger() -> None:
         assert list(db.scalars(select(WorkflowOutcome)).all()) == []
 
 
+def test_non_default_tenant_direct_submit_creates_same_tenant_case_link() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        request = build_request(
+            run_id="application-direct-submit-tenant",
+            tenant_id="tenant-direct-submit",
+        )
+        service = UserAgentService(db)
+        submitted = service._create_expense_application_record(
+            request,
+            build_facts(),
+            submit=True,
+            learning_current_user=service._build_application_current_user(request),
+        )
+
+        link = db.scalar(
+            select(ExpenseCaseLink).where(
+                ExpenseCaseLink.resource_type == "expense_claim",
+                ExpenseCaseLink.resource_id == submitted.id,
+            )
+        )
+        event = db.scalar(
+            select(BusinessEvent).where(
+                BusinessEvent.aggregate_type == "expense_claim",
+                BusinessEvent.aggregate_id == submitted.id,
+                BusinessEvent.event_type == "application_submitted",
+            )
+        )
+        assert submitted.status == "submitted"
+        assert link is not None
+        assert link.tenant_id == "tenant-direct-submit"
+        assert event is not None
+        assert event.tenant_id == "tenant-direct-submit"
+        assert event.expense_case_id == link.expense_case_id
+
+
 @pytest.mark.parametrize(
     "preview_patch",
     [