Add full email management at /admin/emails with:
- email_log table tracking all outgoing emails with resend_id + delivery events
- inbound_emails table for Resend webhook-received messages
- Resend webhook handler (/webhooks/resend) updating delivery status in real-time
- send_email() returns resend_id (str|None) instead of bool; all 9 worker
handlers pass email_type= for per-type filtering
- Admin UI: sent log with HTMX filters, email detail with API-enriched HTML
preview, inbox with unread badges + reply, compose with branded wrapping,
audience management with contact list/remove
- Sidebar Email section with unread badge via blueprint context processor
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Move historical docs from docs/ and .claude/ to research/. Add superseded
notice to research/PLAN.md. Add CHANGELOG entries for previous fixes.
New: PROJECT.md (task tracker), docs/MARKETING.md (marketing strategy).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
