working-with-the-agent: apply the agent's review (fleet, two handles, allowlist mechanism, deploy policy as practiced, off-switch access caveat)

- The co-op now runs more than one isolated agent; the page covers all of
  them and names infrastructure-bot.
- Disambiguates @inference-bot (automation account) from @inferencebot
  (the steward agent members instruct).
- Names the mechanism behind "admitted members": a per-agent allowlist
  plus mention-required rooms.
- Restates the deploy norm to match standing practice (bug and security
  fixes deploy immediately and are reported; member-visible or risky
  changes are confirmed first) and points a stricter norm at the forum.
- Off switch: who can actually reach it, and that stopping is not
  restarting.

getting-started.md

@@ -142,9 +142,9 @@ privacy, and direction happen on our **Loomio forum**:
   space and join whatever is interesting to you. New rooms appear there as
   the co-op grows.
 
-- The updates feed is posted by the co-op's stewarding agent. See
-  [Working with the agent](working-with-the-agent.md) for what it does and
-  how members interact with it.
+- The updates feed is posted by the co-op's automation account. See
+  [Working with the agent](working-with-the-agent.md) for the agents behind
+  it, what they do, and how members interact with them.
 
 - See the [Charter](charter.md) for how governance is structured.
 - See [Open questions](open-questions.md) for the decisions currently on the table.