further simplications...

modules/api/src/main/scala/types.scala

@@ -1,15 +1,12 @@
 import cats.Show
 import cats.syntax.all.*
-import io.circe.{Decoder, Encoder, Codec as CirceCodec}
 import io.github.iltotore.iron.*
 import io.github.iltotore.iron.constraint.all.*
 import sttp.tapir
 import sttp.tapir.Codec.PlainCodec as TapirPlainCodec
 import sttp.tapir.codec.iron.TapirCodecIron
 import sttp.tapir.{CodecFormat, DecodeResult, Codec as TapirCodec, Schema as TapirSchema}
 
-given CirceCodec[Int] = CirceCodec.from(Decoder.decodeInt, Encoder.encodeInt)
-
 extension[L, H: Show, CF <: CodecFormat] (codec: TapirCodec[L, H, CF])
   def iemap[HH](f: H => Either[String, HH])(g: HH => H): TapirCodec[L, HH, CF] =
     codec.mapDecode(s => DecodeResult.fromEitherString(s.show, f(s)))(g)
@@ -18,8 +15,6 @@ private type VersionConstraints = DescribedAs[GreaterEqual[0], "Version must be
 opaque type Version = Int :| VersionConstraints
 
 object Version extends RefinedTypeOps[Int, VersionConstraints, Version], TapirCodecIron:
-  given CirceCodec[Version] = summon[CirceCodec[Int]].iemap(either(_))(_.value)
-
   given TapirPlainCodec[Version] = summon[TapirPlainCodec[Int]].iemap(either(_))(_.value)
 
   given TapirSchema[Version] = ironTypeSchema[Int, VersionConstraints]