Queue outreach pitches for sending

Sends real email to real people. Queues one pitch per contact; with sendNow they go out immediately, otherwise they are paced across the mailbox's daily limit. This cannot be undone once a message leaves - use outreach_queued and the unqueue endpoint to pull back anything still waiting. Write the subject and body yourself, one per contact, personalised to the page named on the prospect. Get contact IDs from outreach_prospect_emails; an address that is not on one of this team's prospects is rejected. Queueing the same contact twice is a no-op, so a retry cannot double-send. Items missing a subject, a body or a valid contact are skipped rather than failing the batch, and the call only errors if nothing at all could be queued - so compare the returned count against what you sent.