Google has been doing this for maybe a decade now with citc [0]. I don't know when Gemini is actually going to be taking advantage of this, but I do know that google has essentially a full history at "Ctrl-S" granularity, from ~every developer that works there, for at least 10 years now.

If Gemini seems stupid nowadays, it's only because they're being stingy with compute allocation.

0 - https://en.wikipedia.org/wiki/Piper_(source_control_system)