API capability pack for bounded Resend API-key calls against https://api.resend.com only. The pack can send and schedule one transactional email, update/cancel one scheduled email, read and search sent and received email, read domains and trigger domain verification, read segments, search/read/create/update/delete contacts, manage contact segment and topic subscriptions, read topics, create/update/send/delete broadcasts, and search/read API request logs. Enroll a Resend API-key connection as a bearer token; no credential is embedded in the manifest. Email sending, scheduled email changes, domain verification, contact mutation, topic/segment subscription changes, and broadcast changes are write-tier and approval-gated. The pack intentionally excludes batch sending, API-key management, webhook management, domain create/update/delete/claim, segment create/delete, topic create/update/delete, contact imports/properties, attachment download, automation/event mutation, and arbitrary API passthrough.