fix: avoid invalid UTF-16 in truncation (#567)

src/cron/isolated-agent.ts

@@ -49,7 +49,7 @@ import {
 import { registerAgentRunContext } from "../infra/agent-events.js";
 import { parseTelegramTarget } from "../telegram/targets.js";
 import { resolveTelegramToken } from "../telegram/token.js";
-import { normalizeE164 } from "../utils.js";
+import { normalizeE164, truncateUtf16Safe } from "../utils.js";
 import type { CronJob } from "./types.js";
 
 export type RunCronAgentTurnResult = {
@@ -68,7 +68,7 @@ function pickSummaryFromOutput(text: string | undefined) {
   const clean = (text ?? "").trim();
   if (!clean) return undefined;
   const limit = 2000;
-  return clean.length > limit ? `${clean.slice(0, limit)}…` : clean;
+  return clean.length > limit ? `${truncateUtf16Safe(clean, limit)}…` : clean;
 }
 
 function pickSummaryFromPayloads(

src/cron/service.ts

@@ -1,5 +1,6 @@
 import crypto from "node:crypto";
 
+import { truncateUtf16Safe } from "../utils.js";
 import { computeNextRunAtMs } from "./schedule.js";
 import { loadCronStore, saveCronStore } from "./store.js";
 import type {
@@ -61,7 +62,7 @@ function normalizeOptionalText(raw: unknown) {
 
 function truncateText(input: string, maxLen: number) {
   if (input.length <= maxLen) return input;
-  return `${input.slice(0, Math.max(0, maxLen - 1)).trimEnd()}…`;
+  return `${truncateUtf16Safe(input, Math.max(0, maxLen - 1)).trimEnd()}…`;
 }
 
 function inferLegacyName(job: {