Can't get migration in module to be recognised by spark migrate --all

Update: I've verified that a Route added under midair/Article/Config.Routes.php works fine, so the app is correctly detecting the autoloaded namespace. It's just the migration from that module that isn't being seen by the php spark call.

I'm executing the php spark --all call on a Docker instance, but I don't see how that can make any difference (and I've already seen it run migrations that are under app).

(PS: Why are you replying to me but not approving my moderated posts?)