Issue #288: when the abbreviated-genus pre-filter (≤3 char genus) yields
exactly one candidate whose species (and subspecies) word(s) exactly match
the input, narrow filtr to that single candidate and set
minimum_matching_score = 0. This bypasses the automatic 0.55 cutoff that
only runs in the is.null() branch, so "S. apiospermum" resolves to
Scedosporium apiospermum without touching the validated scoring formula.
https://claude.ai/code/session_01VH4Ju4Xq9aW1AHuoVbjGEo
d23004641f