Tag the hand-picked rows of the registry as source = "manual"
Source: R/common_names.R
mark_taxon_common_manual.RdThe registry never carried a literal "manual": every fetched row was stamped
source = "worms" whether the value was auto-filled or hand-picked. The two
are told apart by construction — ensure_taxon_common() only ever auto-fills
the one candidate WoRMS offered — so a filled row whose value is not that
single candidate was necessarily a human edit. This writes that
reconstruction into the registry once (it is idempotent), and
ensure_taxon_common() keeps the tag from then on. apply_taxon_common()
reads it as rank 1 of the precedence.