Is there any formalization for the BTC core code development process? In particular, how is QC being addressed? Independent code review before each release?
My concern is that as BTC gathers steam and begins it become a target for central banks, regulators and other entrenched interests in the global economy some will almost certainly seek to subvert it by technical or human means. For example, back-doors or weaknesses that can be only exploited by those who paid for its installation. Its not beneath the intelligence arms of these governments to threaten to kill a developer's wife and kids and show him videos of other people they have done it to, etc.
Research how open source works

Each git commit has its own unique sha1 id, that builds upon the previous commit (also identified by sha1 id), much like bitcoin's block chain itself.
It will be obvious if anybody hacks github.com and adds unwanted source code changes.