== Pre-merge
[x] QA tested before merge ({T156292})
[x] Evaluate and eradicate potential sources of caching issues.
* See below. This feature MUST be enabled as a beta feature, which only logged-in users can enabled. Consequently, there'll be no caching issues.
[x] Ensure that Popups is only enabled for beta feature users in production.
[x] Ensure Popups code does not load for anonymous users.
* ~~This is a //small// change to the `PopupsHooks::onBeforePageDisplay` hook handler: you'll need to update it so that it only adds the `ext.popups` RL module if the user has the beta feature enabled. See https://gerrit.wikimedia.org/r/336718 ~~
[x] Sanity QA check on staging given the change in tooling in {T156333}
[x] Make sure beta is on for huwiki
[x] ~~~Ensure Popups is disabled on Wikidata (TBC)~~~
[x] High five ~~someone~~ EVERYONE 馃檹
== Signoff AC: Post-merge
[x] Resolve T155386 since the documentation is up to date.
[] Review existing Hovercards bugs and resolve any bugs fixed by the refactor and take immense pleasure in seeing the backlog shrink.
[] High five ~~someone~~ EVERYONE 馃檹