* feat: add --idle-timeout CLI flag for daemon auto-shutdown
Add user-friendly --idle-timeout flag that converts time strings
to milliseconds. Supports formats like '10s', '3m', '1h', or raw ms.
This addresses a common need for ephemeral/CI environments where
daemon processes can be orphaned if not explicitly closed, leading
to resource consumption from zombie chrome-headless-shell processes.
Co-authored-by: Hermes (via claude-sonnet-4-20250520) <agent@hermes.ai>
* fix: address idle-timeout review feedback
* fix: normalize idle-timeout parsing
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Co-authored-by: Merlin <merlin@rbeckner.com>
Co-authored-by: Hermes (via claude-sonnet-4-20250520) <agent@hermes.ai>
