Merge fix/web-app-gitlab/design-stack-host into feature/store-i18n

GitLab#0 of fork run 42465517680 attempt 6: the logo slurp now runs once on the stack host.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/web-app-gitlab/tasks/utils/design.yml

@@ -21,5 +21,7 @@
       loop: "{{ GITLAB_DESIGN_UPLOADS }}"
       loop_control:
         label: "{{ item.file }}"
+      delegate_to: "{{ STACK_HOST }}"
+      run_once: true
       register: gitlab_design_files
       when: design_branding.logo is string

tests/unit/python/roles/web-app-gitlab/test_design.py

@@ -0,0 +1,22 @@
+import unittest
+
+from utils.cache.yaml import load_yaml_any
+
+from . import PROJECT_ROOT
+
+DESIGN = PROJECT_ROOT / "roles" / "web-app-gitlab" / "tasks" / "utils" / "design.yml"
+
+
+class TestDesign(unittest.TestCase):
+    def test_the_logo_read_runs_once_on_the_stack_host(self) -> None:
+        block = load_yaml_any(str(DESIGN))[0]["block"]
+        read = next(task for task in block if "ansible.builtin.slurp" in task)
+        self.assertEqual(
+            (read.get("delegate_to"), read.get("run_once")),
+            ("{{ STACK_HOST }}", True),
+            "design_assets renders the logo set only where IS_STACK_HOST holds, so a swarm worker that slurps it finds no file",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()