Write launch announcement emails and changelog digests for product releases. Use this skill whenever someone asks to write a launch email, draft an announcement email, create a product update email, write a changelog digest, or compose an email to accompany a product launch. Also trigger for "write the email for this launch," "draft the announcement email," "help me email our users about this," or any request to craft email copy tied to a product ship. Covers subject lines, announcement structure, segment-specific emails, changelog digests, and timing relative to social.