refactor: consolidate typing lifecycle and queue policy

src/auto-reply/reply/typing.ts

@@ -1,3 +1,4 @@
+import { createTypingKeepaliveLoop } from "../../channels/typing-lifecycle.js";
 import { isSilentReplyText, SILENT_REPLY_TOKEN } from "../tokens.js";
 
 export type TypingController = {
@@ -35,7 +36,6 @@ export function createTypingController(params: {
   // especially when upstream event emitters don't await async listeners.
   // Once we stop typing, we "seal" the controller so late events can't restart typing forever.
   let sealed = false;
-  let typingTimer: NodeJS.Timeout | undefined;
   let typingTtlTimer: NodeJS.Timeout | undefined;
   const typingIntervalMs = typingIntervalSeconds * 1000;
 
@@ -61,10 +61,7 @@ export function createTypingController(params: {
       clearTimeout(typingTtlTimer);
       typingTtlTimer = undefined;
     }
-    if (typingTimer) {
-      clearInterval(typingTimer);
-      typingTimer = undefined;
-    }
+    typingLoop.stop();
     // Notify the channel to stop its typing indicator (e.g., on NO_REPLY).
     // This fires only once (sealed prevents re-entry).
     if (active) {
@@ -88,7 +85,7 @@ export function createTypingController(params: {
       clearTimeout(typingTtlTimer);
     }
     typingTtlTimer = setTimeout(() => {
-      if (!typingTimer) {
+      if (!typingLoop.isRunning()) {
         return;
       }
       log?.(`typing TTL reached (${formatTypingTtl(typingTtlMs)}); stopping typing indicator`);
@@ -105,6 +102,11 @@ export function createTypingController(params: {
     await onReplyStart?.();
   };
 
+  const typingLoop = createTypingKeepaliveLoop({
+    intervalMs: typingIntervalMs,
+    onTick: triggerTyping,
+  });
+
   const ensureStart = async () => {
     if (sealed) {
       return;
@@ -146,16 +148,11 @@ export function createTypingController(params: {
     if (!onReplyStart) {
       return;
     }
-    if (typingIntervalMs <= 0) {
-      return;
-    }
-    if (typingTimer) {
+    if (typingLoop.isRunning()) {
       return;
     }
     await ensureStart();
-    typingTimer = setInterval(() => {
-      void triggerTyping();
-    }, typingIntervalMs);
+    typingLoop.start();
   };
 
   const startTypingOnText = async (text?: string) => {