Add weekly_harvest.sh wrapper that:
- Runs discover_current_menu.py to fetch this week's 23 active menu slugs
- Runs scrape_live.py with --resume to scrape only new slugs
- Appends timestamped output to /Library/Assets/kiwi/pipeline/logs/
Cron entry added to system crontab:
0 23 * * 0 (every Sunday 23:00)
Logs: /Library/Assets/kiwi/pipeline/logs/purple_carrot_harvest.log
