core: Implement basic git integration

Missing streaming, so git's a bit confused, but works.

Also easy to bypass. Although I doubt any mf at alibaba gon bypass it
with his custom UA.

README.md

@@ -17,6 +17,7 @@ AI scrapers are everywhere. This will stop them. `robots.txt` won't.
 - Dynamic challenge amount (aka difficulty)
 - Detection of token overuse
 - Better wait screen
+- Better git integration (it's quite rudimentary right now)
 
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