- New test/integration/email_repository_jmap_test.dart covers full sync, incremental sync, server-side deletion reconciliation, getEmailBody with cache, sendEmail, and flushPendingChanges (flag, delete, move). - Fix: Email/set destroy must be an array per RFC 8620 §5.3; was passing a bare string which Stalwart silently rejected. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>