It seems like the overwhelming majority of ships in your mod don't have codex entries. Is that intentional?
All of the Epattcud ships share the same codex entry right now, regardless of their size or weapon layout.
Most ships should actually have codex entries, but many are hidden from the player if you search them as they are not in the independent public database in the lore. If you find any I missed that say "There's no description, yet..." feel free to send a reply on here.
In terms of hegemony ships, there aren't that many yet as I need to plan out the content for filling other holes in their lore.
Edit: If you want to see hidden codex entries, try recovering one of the ships you want to see the entry for. It should have one
.