Feishu: drop stale runtime onboarding export

extensions/feishu/src/channel.runtime.ts

@@ -1,5 +1,4 @@
 export { listFeishuDirectoryGroupsLive, listFeishuDirectoryPeersLive } from "./directory.js";
-export { feishuOnboardingAdapter } from "./onboarding.js";
 export { feishuOutbound } from "./outbound.js";
 export { probeFeishu } from "./probe.js";
 export { addReactionFeishu, listReactionsFeishu, removeReactionFeishu } from "./reactions.js";