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

src/session-commands.ts

@@ -1,7 +1,7 @@
 import { getAgentOutputText } from './agent-output.js';
 import type { NewMessage } from './types.js';
 import { logger } from './logger.js';
-import { formatOutbound } from './router.js';
+import { sanitizeForOutbound } from './router.js';
 import type { StructuredAgentOutput } from './types.js';
 
 const SESSION_COMMAND_CONTROL_PATTERNS = [
@@ -86,7 +86,7 @@ function agentResultToText(result: AgentResult): string {
     result: result.result ?? null,
     output: result.output,
   });
-  return raw ? formatOutbound(raw) : '';
+  return raw ? sanitizeForOutbound(raw) : '';
 }
 
 /**