Sub-ticket of PLUTO-444 Native agent/PM-triggerable ticket reply: new secret-gated POST /api/internal/support-reply (Bearer INTERNAL_EMAIL_KEY, mirror /api/internal/send-email) so the PM/operator can post a support-ticket reply programmatically -> user gets it as in-app staff comment (supportTicketMessages authorRole=staff) AND email (sendSupportReplyEmail), 'as if a human operates the app'. Impl: extract postSupportReply core into a shared helper taking explicit actorUserId; both the existing manageSupport server action AND the new endpoint call it. DESIGN Q (resolve w/ audit): actor identity for the realUserId stamp + archive sentinel — dedicated system 'Soporte' operator user vs Elazar's id. GATED: email-send + auth path -> audit pre-impl design-ping + pre-push diff review before push. Optional add closeAndNotify endpoint too. · pluto