Basic Stuff
Spot check siteCheck footer, social icons and top-nav links to make sure they're wired up correctly
Quick proof of copy on homepage
Check main hp links/buttons to make sure they're wired up correctly
Device & browser testing
Make sure Google fonts are loading when viewing on a phone
Check misc. default pages and make sure they don't look horrible (search, user login, 404, etc)
Drupal Stuff
Create & upload favicon if neededDouble check site title and email address in config > site settings
Add default meta info via config > metatag > global (Pull description/keywords from about page)
Add final domain name to config > xml sitemap > settings > default base URL
Double check sitemap to make sure no weird dummy pages are pulling in
Also check that necessary content types are pulling in. If not, enable sitemap inclusion on CT edit panel
Delete any dummy content pages, news, etc (except for style guide)
Test email sending via config > smtp - just plug in your email and confirm you receive
Update all contact forms w/ client email address via form > settings > email handlers > notifications
Add company name to email subject in form (example: Triad Website Contact)
Add google analytics/tag code via dashboard
Make sure editor has permissions to edit/add/delete any new content types
Add any other special editor permissions, if necessary (new modules, etc)
Log in as editor and test basic CMS functionality
Set page/block caching to 15 minutes & enable css/js aggregation (config>performance)
Pantheon Stuff
Commit changes, if neededBack up dev environment
Check for any core updates. Install, if available.
Check for any modules updates. Install, if available. (extend > update)
Back up dev environment again
Lock dev site via security tab, with triad/password
Push dev to test, and test to live