feat(csm): bootstrap discussion callback flow

plugin/hooks/message-received.ts

@@ -18,6 +18,9 @@ type MessageReceivedDeps = {
   recordChannelAccount: (api: OpenClawPluginApi, channelId: string, accountId: string) => boolean;
   extractMentionedUserIds: (content: string) => string[];
   buildUserIdToAccountIdMap: (api: OpenClawPluginApi) => Map<string, string>;
+  discussionService?: {
+    maybeReplyClosedChannel: (channelId: string, senderId?: string) => Promise<boolean>;
+  };
 };
 
 export function registerMessageReceivedHook(deps: MessageReceivedDeps): void {
@@ -31,6 +34,7 @@ export function registerMessageReceivedHook(deps: MessageReceivedDeps): void {
     recordChannelAccount,
     extractMentionedUserIds,
     buildUserIdToAccountIdMap,
+    discussionService,
   } = deps;
 
   api.on("message_received", async (event, ctx) => {
@@ -51,6 +55,11 @@ export function registerMessageReceivedHook(deps: MessageReceivedDeps): void {
           (typeof (e as Record<string, unknown>).from === "string" ? ((e as Record<string, unknown>).from as string) : "");
 
         const moderatorUserId = getModeratorUserId(livePre);
+        if (discussionService) {
+          const closedHandled = await discussionService.maybeReplyClosedChannel(preChannelId, from);
+          if (closedHandled) return;
+        }
+
         if (moderatorUserId && from === moderatorUserId) {
           if (shouldDebugLog(livePre, preChannelId)) {
             api.logger.info(`dirigent: ignoring moderator message in channel=${preChannelId}`);