How does VW handle SE sitemap submissions?

After migration from VW3 my wiki has a very large number of issues which we need to clean up. Some we can address with mass tool and database work. Others need a very large community effort or other solutions that will take time.

I would like to put my wiki visible to guests and search engines. For its content and also for showing me some of the dead links.
But I do not want to have my wiki indexed with dead links without getting the pages updated in Google.
How does the sitemap function for vaultwiki work?

Are search engines alerted about new edits? How about minor edits?
What happens after using the mass tool?
Is there a way to mark pages as updated to search engines after doing database work?