{"api_messages":"http://localhost:5000/api/messages — channel messages JSON only (localhost only)","health":"/health — liveness/readiness (GET or HEAD)","hint":"Microsoft Graph notifications go to POST /webhook; validation uses ?validationToken= on GET or POST /webhook","local_feed":"http://localhost:5000/local/messages — full feed (localhost only)","ok":true,"traffic":"/debug/traffic — recent request/response bodies (append ?clear=1 to reset)","webhook":"/webhook"}