Refine discussion moderator messaging flow

plugin/hooks/before-message-write.ts

@@ -24,7 +24,7 @@ type BeforeMessageWriteDeps = {
     channelId: string,
     content: string,
     logger: { info: (m: string) => void; warn: (m: string) => void },
-  ) => Promise<void>;
+  ) => Promise<unknown>;
   discussionService?: {
     maybeSendIdleReminder: (channelId: string) => Promise<void>;
     getDiscussion: (channelId: string) => { status: string } | undefined;