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.

README.md

@@ -16,7 +16,7 @@ funded through our [Open Collective](https://opencollective.com/inference-cooper
 - **Want API access?** → [API access](api-access.md) — use our models programmatically.
 - **Want community chat?** → [Getting started · Matrix](getting-started.md) — our federated Matrix server, including how to connect from any client and how to use an existing Matrix account.
 - **Curious how it works?** → [Infrastructure](infrastructure.md) — a map of the stack and the codebase.
-- **Wondering about the bot?** → [Working with the agent](working-with-the-agent.md) — what inferencebot does, who can instruct it, and what always needs a human.
+- **Wondering about the bot?** → [Working with the agent](working-with-the-agent.md) — what the co-op's agents do, who can instruct them, and what always needs a human.
 - **Need help or have an idea?** → [Support & feature requests](https://git.inference.coop/co-op/support) — open an issue.
 
 ## Key links