fix(router): escape Discord markdown delimiters instead of stripping

src/message-turn-controller.ts

@@ -4,7 +4,7 @@ import {
   getAgentOutputText,
 } from './agent-output.js';
 import { createScopedLogger, logger } from './logger.js';
-import { formatOutbound } from './router.js';
+import { sanitizeForOutbound } from './router.js';
 import { shouldResetSessionOnAgentFailure } from './session-recovery.js';
 import { TASK_STATUS_MESSAGE_PREFIX } from './task-watch-status.js';
 import { formatElapsedKorean } from './utils.js';
@@ -169,7 +169,10 @@ export class MessageTurnController {
     }
 
     const raw = getAgentOutputText(result);
-    const text = raw ? formatOutbound(raw) : null;
+    // Use sanitize (no markdown escape) — the Discord channel boundary
+    // applies the final escape pass, and double-escaping would produce
+    // visible backslash garbage.
+    const text = raw ? sanitizeForOutbound(raw) : null;
     const attachments = getAgentOutputAttachments(result);
 
     if (raw) {