Sorry, git blame might be able to hold people accountable for their decisions. This is the reason it would take revolution or something equally disruptive to introduce it.

I'm always surprised at how many people naively suppose that bloodshed will automatically generate political reform.

You have sort of a logical fallacy there. You're presuming that people assume "if (bloodshed) then (reform)" but I think what is generally assumed is "if not(bloodshed) then not(reform)". Using boolean algebra, let p be (bloodshed) and q be (reform), then what is assumed is !p -> !q which (and it's been a little while since my boolean algebra classes) would be identical to q -> p, i.e. the inverse of what you said, reform implies that there was bloodshed or rather that reform cannot happen without bloodshed. In that light, I think how many people naively supposing that reform can only come from bloodshed is pretty surprising. However, it seems to be the case that the threat of bloodshed tends to be a strong motivator for action; however, the action is not always what's desired. What is viewed as an external threat (e.g. Oklahoma City Bombing, McVeigh et al are viewed as dangerous extremists not "America's own sons") and thus reaction to their wishes--apparently that the US move away from a dominant federal government--was largely in the reverse; whether by their actions or others, the federal government since 1995 has probably gotten considerably more powerful.

You're hardly the first to think this up: https://en.wikipedia.org/wiki/Open-source_governance

Of course, this would require politicians to have some basic technical literacy. Though I wouldn't imagine using a VCS to be difficult, even for an unacquainted person.

It doesn't really require much of the individual MP or Congresspersion, just their office.

That's why GUIs and potentially always watching directories would be perfect for them.

More than interesting. It would be a way to account what people say and what they do.

What is the most serious attempt out there of trying this?

I would want a law saying all bills must be put through a system that can be audited to see precisely who makes the changes.

And if it allows pull requests like GitHub, anyone could fork a bill, make a change, and people could comment on the best proposed recordings.

I think this could honestly get people more involved in politics in a productive way, rather than watching talking heads spout reactionary crystal ball gazing on the 24 hour news networks.

Which is why there isn't such a thing. :)