docs(agents): HA todo HUD field lessons (get_items/rename pattern) [#441]

How to read and rename founder todo-list items via HA REST for the
Redmine [#NNN] sync-back workflow.

Detail: https://projects.knownelement.com/issues/441 (latest notes)

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AGENTS.md

@@ -725,3 +725,9 @@ All work is tracked in [Redmine](https://projects.knownelement.com)
   two levers for agent-driven HA setup.
 - **mvdan/sh `source a b` silently ignores file b** — source env files
   one per line.
+- **HA todo lists (founder HUD):** items are hidden from `/api/states` —
+  fetch via `POST /api/services/todo/get_items?return_response=true`.
+  Renaming works ONLY with a minimal `todo/update_item` payload
+  (`entity_id`, `item`=<uid>, `rename`); passing `status`/`due` back earns
+  a 400. HUD summaries carry `[#NNN]` Redmine prefixes — sync completed
+  items back to Redmine when the founder asks.