Use the existing SSRF hostname/IP classifier for Voice Call and Google Meet webhook exposure checks so bracketed IPv6 loopback, unique-local, link-local, and IPv4-mapped local/private addresses fail before Twilio/Meet joins while public hostnames are not rejected by prefix accidents.
Thanks @clawsweeper, @donkeykong91, and @PfanP.
Routes stateful Google Meet tool actions through the gateway-owned runtime so create/join/status/speak/leave share the same session owner instead of losing tool-created realtime sessions after the agent turn.
Also preserves structured gateway error details for missing session ids and tightens node-host child cleanup for already-closed sessions.
Fixes#72440.
Co-authored-by: BSnizND <199837910+BsnizND@users.noreply.github.com>