docs: synchronize MESSAGING.md, IMPROVEMENTS.md, implementation_plan.md and add D-31/D-32 freshness guards

deploy/gitea-ci.yml

@@ -85,6 +85,8 @@ jobs:
     steps:
       - name: Checkout Code
         uses: actions/checkout@v3
+        with:
+          submodules: recursive
 
       - name: Set up Python
         uses: actions/setup-python@v4