docs: add request_update_meta_inputs to manager tools (follow-up to 3e098c5)

docs/turn-loop.md

@@ -287,6 +287,12 @@ meta's.
 - `request_apply_commit(agent, commit_ref)` — submit a config
   change for any agent (`hm1nd` for the manager's own config) for
   operator approval.
+- `request_update_meta_inputs(inputs?, description?)` — queue an
+  approval to run `nix flake update [inputs...]` on the meta flake.
+  Pass specific input names (e.g. `["bitburner-agent"]`) or omit
+  for all. Returns immediately; lock update runs on operator
+  approval. Does NOT trigger rebuilds — call `update(name)` on
+  affected agents after approval resolves.
 - `ask(question, options?, multi?, ttl_seconds?, to?)` —
   surface a structured question to the operator (default) or a
   sub-agent (`to: "<agent>"`). Non-blocking — returns the