Slack: expose threadTs in agent sendMessage tool for thread replies

src/slack/actions.ts

@@ -151,6 +151,7 @@ export async function sendSlackMessage(
     accountId: opts.accountId,
     token: opts.token,
     mediaUrl: opts.mediaUrl,
+    threadTs: opts.threadTs,
     client: opts.client,
     threadTs: opts.threadTs,
   });