Also, inherit the Elvish phonemes from Latin, because Esperanto doesn’t
have /y/. (Quenya doesn’t need that – ⟨y⟩ is a consonant there – so
maybe I’ll separate their phonemes at some point. For now, Latin works
well enough for both as far as I can tell.)

This prepares the languages of Quenya and Sindarin, setting up their
infrastructure without declaring a lot of rules yet – just enough for
“Eä” (a Quenya word, but I can’t think of a similarly simple one for
Sindarin). Phonemes are inherited from Esperanto for now.