rename check_monitors -> check_relays, add history mode via name param
tool name is now honest about what it checks (relays, not abstract
"monitors"). adds optional name + limit params with Annotated Field
descriptions so the LLM sees what each does. name set = per-relay
history from /api/phi/history, name omitted = fleet snapshot from
/api/phi/monitors.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>