Added support for task preconditions that allow users to specify conditions
under which tasks should execute. Precondition conditions include:
- day_of_week: restrict execution to specific days (e.g., "1-5" for weekdays)
- time_range: restrict execution to specific time ranges (e.g., "09:00-17:00")
- env_set: require specific environment variables to be set
- expr: complex expressions using Go template syntax
Both pre_check and precondition conditions must pass for a task to run.
If any precondition fails, the task is skipped with a clear skip reason.
Example usage:
---
schedule: "0 9 * * *"
precondition:
 day_of_week: "1-5" # only weekdays
 time_range: "09:00-17:00" # only business hours
 env_set: "CI" # only when CI env var is set
---
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>