Cron jobs are executing successfully but the announce delivery to Telegram is failing with error 'cron announce delivery failed'.

Environment:

• OpenClaw version: 2026.2.19-2
• Gateway running on macOS

Steps to reproduce:

1. Set up a cron job with --announce to Telegram
2. Wait for cron to run
3. Job executes successfully but delivery fails

Expected behavior:

• Cron results should be delivered to Telegram

Actual behavior:

• Job runs successfully (exit code 0)
• But 'cron announce delivery failed' error appears
• Message never reaches Telegram

Additional notes:

• Direct Telegram messaging works (tested manually)
• This started happening after recent Gateway updates