* docs(agent-loop): correct default timeoutSeconds from 600s to 172800s (48h)
The default was raised to 48 hours in PR #51874 (merged 2026-03-21) to
avoid cutting off long-running ACP sessions, but the docs were not
updated at the time. Closes#55380.
* docs: remove 'Use 0 to disable' per aisle security review