Change 204230 had a related patch set uploaded (by Aude):
Add supportsDirectEditing methods to ContentHandler

https://gerrit.wikimedia.org/r/204230

first step is to add the mechanism in core, which is what https://gerrit.wikimedia.org/r/204230 does

then we can remove the ApiCheckCanExecute hook stuff in Wikibase

for mobile, adapt it to use the new mechanism, probably with a method_exists check on ContentHandler, assuming they care about backwards compatibility. then we don't need the SkinMinvera hook code in Wikibase.

Change 204230 merged by jenkins-bot:
Add supportsDirectEditing methods to ContentHandler

https://gerrit.wikimedia.org/r/204230

Core patch is merged. Wikibase patch for using the new logic is pending.

Patch for mobile is also still pending.

The core patch means that edits to wikibase items can no longer be undone through the API T101694