#26 · Article scheduled publishing — submit now, publish at future date

Context

Authors should be able to draft an article and schedule it to publish at a specific time (newsletter cadence, embargoed announcements, weekend publishing).

Acceptance criteria

• [ ] Article form has scheduled_for (ISO datetime) field, optional
• [ ] scheduled_for in the future + status='approved' → article hidden from feed until that time
• [ ] Cron (every 5 min) flips eligible scheduled articles to status='published'
• [ ] API endpoint /api/articles?include_scheduled=1 (admin only) to preview pipeline
• [ ] Email author when their scheduled article goes live

Technical hints

• Add scheduled_for TEXT column to articles D1 table via new migration
• Cron in wrangler.toml — every 5 min: "*/5 * * * *"
• Use the field-notes existing review-status state machine

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