[eponeponepon]

Self-evidently it is possible to gather a high quality repository of knowledge; it's been done many times in history.

I suspect that the real solution is an absence of secrecy - indefinite hoarding of information is no help to anyone except those who want their egos stroked by the number of "things" they have, and knowledge that nobody can access is barely knowledge at all.

As far as noise goes, you can never hope to rub it out completely. There will always be transcription errors, deliberate mistruths and gaps - the most you can do is carefully curate the repository to make sure you catch and repair as much as possible.

Essentially, the closest thing we have is probably Wikipedia. I don't know if that's especially complimentary to us as a species.