No, Pantheon doesn’t have a recommended process. Everything is handled like any other WordPress website, upload plugin, activate plugin, move on.
EE doesn’t seem to register its class on each new deploy to higher level environments. At the basic Development level I can simply re-upload the plugin again and it registers its class with a new installation/activation, but the other enviroments are read-only and only allow plugins to be activated or deactivated (no delete, upload option). But so far EE isn’t working unless I’m able to re-upload the zip folder, which seems to be to be a very complicated/long process altogether each time one needs to make the plugin work.