refactor: tighten plugin sdk channel seams

src/plugin-sdk/feishu.ts

@@ -76,6 +76,10 @@ export {
   createDefaultChannelRuntimeState,
 } from "./status-helpers.js";
 export { withTempDownloadPath } from "./temp-path.js";
+export {
+  buildFeishuConversationId,
+  parseFeishuConversationId,
+} from "../../extensions/feishu/src/conversation-id.js";
 export {
   createFixedWindowRateLimiter,
   createWebhookAnomalyTracker,