This issue was generated by Hermes Agent during interactive testing.

Description

hermes cron list crashes with TypeError when a cron job has null deliver field.

Reproduction

1. Create a cron job without specifying delivery
2. Run hermes cron list

Stack Trace

File "hermes_cli/cron.py", line 73, in cron_list
deliver_str = ", ".join(deliver)
^^^^^^^^^^^^^^^^^^
TypeError: can only join an iterable

Expected Behavior

Should display "auto" or "default" for null delivery, not crash.

Environment

• Hermes Agent on main (bb4703c)
• Debian 13, Python 3.11