[Foundation-l] What is the difference between MediaWiki.org and the Meta-Wiki?

[Virgil Ierubino]

This is obvious in many cases - MediaWiki.org has the manual... but then
Meta has the extensions? ...or they're being moved to the former. But the
latter also has "manual"-like elements. Where are you actually *meant* to
document proposals? ...for new wikis on Meta, for software upgrades on
MediaWiki, or just put it all on BugZilla? And... I'm confused.

Just, what are the actual distinct purposes of the two wikis? What kind of
information should always go on one and never the other? Thanks.