Separate source from configuration
A reproducible installation needs a lockfile, a supported runtime and commands that work from a clean checkout. Keep secrets out of the repository and provide an environment example containing names, never actual credentials. Document which values are public and which are server-only. A local preview address is not a verified production domain; a mail address in a brief does not prove working DNS. Track those external assumptions as launch tasks.
Test the user’s paths in a release build
Build mode can expose problems hidden by development tooling. Check the main navigation, language preservation, filters, form rejection and the unavailable-provider state. Use a local mail catcher to verify SMTP acceptance without sending test messages to an external inbox. Inspect small screens, enlarged text, keyboard navigation and reduced motion. Record the environment and results rather than promising universal performance from one machine.
Define what recovery looks like
A deployment guide should explain how to identify the current version and return to a known working one. For systems with persistent data, backup and restoration need their own verification; a code rollback cannot restore lost records. Keep logs useful without recording complete personal enquiries. Align monitoring with actions someone can actually take, and do not label basic monitoring as a staffed on-call service.
Hand over the open decisions
A good handover includes what remains unverified: provider credentials, domain ownership, contact availability, legal review and human proofreading. It names the owner of each decision and explains how to check it. Keep content separate from layout so future edits do not require rebuilding every component. Launch is not a screenshot or a green build badge. It is a controlled transition from a testable artifact to an operated service.