some streamers have this already & as usual, it's opt-in by default
If you are opted into this (unsure if any notifications were sent, they usually aren't) then you can disable it in your creator dashboard under Settings - Stream
If it's not active on your channel the option won't be there
Twitch AI Stream Summary is out in the wild.
So far, in most examples I've seen, the summary is accurate only for short-term data (the previous 5-ish minutes), and beyond that timeframe, what it remembers is often not relevant to what's happening now.