!Nemo_bis fixed {{T101358}} and created Module:Callsign with the project mapping \o/. There are [[ https://www.mediawiki.org/wiki/Special:Search/insource:%22git.wikimedia.org%22 | many other links to git.wikimedia.org]] on mw.org.
Here are some templates I've found, check these off as they're fixed:
[] the [[ https://www.mediawiki.org/wiki/Template:Gitblit | Template:Gitblit ]] template should be made a redirect to a new `{{git project}}`. Perhaps this could just invoke `{{git file |project=PARAM_HERE |action=summary `.
On extension pages ([[ https://www.mediawiki.org/wiki/Extension:AntiSpoof | sample ]]),
[] [[ https://www.mediawiki.org/wiki/Template:Extension | Template:Extension ]] produces (Git master), repo summary, browse file tree, and commit history links to git.wikimedia.org
[] [[ https://www.mediawiki.org/wiki/Template:WikimediaGitCheckout |Template:WikimediaGitCheckout ]] produces Browse tags and Browse branches links to git.wikimedia.org
[] something is invoking Template:Gitblit
On [[ https://www.mediawiki.org/wiki/Developers/Maintainers | Developers/Maintainers ]],
[ ] [[ https://www.mediawiki.org/wiki/Special:PrefixIndex/Developers/Maintainers | subpage templates ]] produce Gerrit links to git.wikimedia.org