Bulk update contacts

Update multiple contacts at once in one call instead of looping per contact. Same fields as single update, max 500 contacts per request. To discard named or picked people, set update.lifecycleStage to "rejected" (optionally with update.qualificationNotes explaining why) — discarding is reversible, it never deletes the contact, and the row still shows up in the list marked as not a fit. To undo a named not-a-fit mark, set update.lifecycleStage to "contact". A described rule is not a write: peek then propose with filter_contacts intent:"discard" or exceptContactIds. lifecycleStage, hotScore, and qualificationNotes are per-campaign fields: pass campaignId to scope the write to one campaign, or the request is rejected.