The facts bar grouped by raw author email, then resolved each address to an account name, so one person with several addresses got a row each, often under the same displayed name.
Contributors now reads history with --use-mailmap, so a repository's
own .mailmap merges the addresses it knows about; a bare repo resolves
that from HEAD:.mailmap with no config. Rows whose address is a verified
address on the same account then fold together, keeping the busiest
address for the tooltip. Addresses with neither stay distinct — two people
sharing a git name are not one contributor. The cap applies after
collapsing, so Contributors no longer takes it.
Also: one commit is "1 commit".
Closes #56