Add people to the workspace by email [write, owner or admin]

Up to 50 emails per call; the workspace may hold at most 200 pending invitations in total. To invite more than 50 people, send multiple calls. Set send_email to true to send invitation mail and include per-email delivery results. sent means provider acceptance; unavailable leaves a usable link to share. No email is sent and no delivery field is returned by default. The response carries one link token per new invitation (shown only here; links are /join/{token} on the consumer app). Each person joins through the link, or the next time they use AgentSky signed in with that verified email; an invitation lasts 30 days.