(...)
Automagically by you, since you currently a release team member and
must pay attention to every bit of code ever written for squeak :)
(...)
Not the case for any kind of summoning. But there should be some level
of testing. At least to detect dead links to repositories and to detect
orphaned packages. If a package is orphaned long enough, there should
be a policy for tagging and moving it to a special place... Regarding
to orphaned packages I like Fedora model for announcing it and seeking
for new maintainers. I also think that their model for responsibility
delegation chain (it is far from perfect and sometimes not quite
"democratic" but works most of time) is quite reasonable.