Contact Upsert

Creates or updates a contact by email, sets core fields, and ensures group membership.

Usage

/contact-upsert --name "Ada Lovelace" --email ada@example.com \
  --phone "+1-555-123-4567" --organization "Analytical Engine" \
  --title "Engineer" --groups "VIP,Engineering"

Behavior

1. Finds an existing contact by email (server-side filter).
2. If found, updates name/org/title/phone; if not, creates a new contact.
3. Adds email/phone as multi-value elements (no overwrite of other values).
4. Ensures membership in the provided groups (creates groups if missing).
5. Saves changes via Contacts.