+1 with Lydia, we don't have a stable policy for Lexemes yet. However, I like to be informed of the changes, so I can go to the person who asked for it and say "look, we did the thing" :)
FYI, in the MoM board we have a column "needs announcement" between "PM review" and "done", that's an example of process to make sure that things are announced. I let you think on how you would like to do :)
It's in prod now, can't think of anything else that needs to be done.
https://www.wikidata.org/w/index.php?title=Lexeme_Talk:L42&action=edit&redlink=1 (mind the lowercase "Lexeme talk" on the page)
However: in my eyes it's strange that us devs need to close tickets, the owner should.