Consolidates the surviving mappings from PRs #53509 (@xqdwww),
#29876 (@mihalyschroth), and #32842 (@vizicist, for @waefrebeorn's
bounty account) into contributors/emails/ files — the frozen
AUTHOR_MAP in release.py is not edited (the reason those PRs
couldn't merge as-is). Entries from those PRs already present on
main are skipped. All bare-noreply logins verified via the GitHub
users API.
Salvaged from @xqdwww (#53509), @mihalyschroth (#29876),
@vizicist (#32842).
Teknium