Prepare the Seriatim source installation plan

AGENTS.md

@@ -55,8 +55,10 @@ link and a concise deployment consequence are sufficient.
 - Keep standalone application roles independently usable. Cross-application
   policy belongs in `ansible-role-dnd-pipeline` and is exposed to consumers as
   `rakestraw.dnd.pipeline`.
-- Use `ansible.builtin` modules directly unless a concrete requirement justifies
-  another dependency.
+- Prefer `ansible.builtin` modules where they directly fit the task.
+  `community.general` is an approved, stable dependency and its modules may be
+  selected freely when appropriate; declare and pin the collection wherever a
+  role or collection depends on it.
 - Prefer codebase-memory graph tools for code discovery. Use text/file search
   for documentation, configuration, literals, or when the graph is
   insufficient.