refactor: remove enum-map lookup wrappers

std/enummap/enummap.hon

@@ -21,7 +21,7 @@ init proc(
 
 #! initializes absent value slots without making their keys present.
 #! use fully initialized storage when a sparse map must be materialized at compile time.
-init_filled proc(
+init_default proc(
     $E, $V type,
     storage_default V,
     values meta.EnumFieldStruct(E, ?V, some!(null)),

std/enummap/enummap.test.hon

@@ -26,7 +26,7 @@ handles_sparse_enum_get test {
 }
 
 @hide:file
-sparse_optional_values :: $init_filled(TestEnum, ?i16, null, {
+sparse_optional_values :: $init_default(TestEnum, ?i16, null, {
     ident = some!(null),
     int = some!(some!(i16(42))),
 })