fix: sanitize user-facing errors and strip final tags

Co-authored-by: Drake Thomsen <drake.thomsen@example.com>

src/auto-reply/reply/normalize-reply.ts

@@ -1,6 +1,7 @@
 import { stripHeartbeatToken } from "../heartbeat.js";
 import { HEARTBEAT_TOKEN, isSilentReplyText, SILENT_REPLY_TOKEN } from "../tokens.js";
 import type { ReplyPayload } from "../types.js";
+import { sanitizeUserFacingText } from "../../agents/pi-embedded-helpers.js";
 import {
   resolveResponsePrefixTemplate,
   type ResponsePrefixContext,
@@ -42,6 +43,11 @@ export function normalizeReplyPayload(
     text = stripped.text;
   }
 
+  if (text) {
+    text = sanitizeUserFacingText(text);
+  }
+  if (!text?.trim() && !hasMedia) return null;
+
   // Resolve template variables in responsePrefix if context is provided
   const effectivePrefix = opts.responsePrefixContext
     ? resolveResponsePrefixTemplate(opts.responsePrefix, opts.responsePrefixContext)