createCanonicalChat sends follow_profile_config and ensureGroupChatSession
sends room_plumbing + follow_profile_config again, as main's plugin.js did
before the rebuild. Without them, bot sessions created by this branch fell
back to the server's legacy title heuristics (exact 'Bot Chat' title;
hidden + 'Group: ' prefix) — the exact dependence the explicit contracts
were introduced to replace. Contract-shape tests pin both params.
Teknium
d22e8e4022