fix: align discussion workspace and tool schemas

plugin/hooks/before-model-resolve.ts

@@ -21,6 +21,7 @@ type BeforeModelResolveDeps = {
   sessionAllowed: Map<string, boolean>;
   sessionChannelId: Map<string, string>;
   sessionAccountId: Map<string, string>;
+  recordDiscussionSession?: (channelId: string, sessionKey: string) => void;
   forceNoReplySessions: Set<string>;
   policyState: { channelPolicies: Record<string, unknown> };
   DECISION_TTL_MS: number;
@@ -43,6 +44,7 @@ export function registerBeforeModelResolveHook(deps: BeforeModelResolveDeps): vo
     sessionAllowed,
     sessionChannelId,
     sessionAccountId,
+    recordDiscussionSession,
     forceNoReplySessions,
     policyState,
     DECISION_TTL_MS,
@@ -92,6 +94,7 @@ export function registerBeforeModelResolveHook(deps: BeforeModelResolveDeps): vo
 
     if (derived.channelId) {
       sessionChannelId.set(key, derived.channelId);
+      recordDiscussionSession?.(derived.channelId, key);
       if (discussionService?.isClosedDiscussion(derived.channelId)) {
         sessionAllowed.set(key, false);
         api.logger.info(`dirigent: before_model_resolve forcing no-reply for closed discussion channel=${derived.channelId} session=${key}`);