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- MailInternalDto accepts attachments[]; deposit() stores each as a media part (image/video→MEDIA_REF, audio→VOICE_REF, else FILE_REF) - ingest now persists part sizeBytes; contract + DTO carry it - threads.getMessages returns mimeType + sizeBytes so mail readers can render inline images / file chips - test: internal mail stores an image attachment as a MEDIA_REF part Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>