fix: reconsider v2 clone over http

[bctnry]

context:

• https://xeiaso.net/notes/2025/distributed-git-ddos/?utm_campaign=mi_irl&utm_medium=social&utm_source=mastodon
• https://inbox.sourceware.org/overseers/20251229005935.GJ30914@gnu.wildebeest.org/T/

todo list:

• switch that turns on/off v2 (must do) done with commit 94cda02
• implement v2 ourselves??