fix(rules): Serializers

Added small changes

modules/rule/src/main/scala/de/nowchess/rules/json/MoveTypeDeserializer.scala

@@ -6,6 +6,7 @@ import com.fasterxml.jackson.databind.{DeserializationContext, JsonDeserializer}
 import de.nowchess.api.move.{MoveType, PromotionPiece}
 
 class MoveTypeDeserializer extends JsonDeserializer[MoveType]:
+  // scalafix:off DisableSyntax.throw
   override def deserialize(p: JsonParser, ctx: DeserializationContext): MoveType =
     val node = p.getCodec.readTree[ObjectNode](p)
     node.get("type").asText() match
@@ -15,3 +16,4 @@ class MoveTypeDeserializer extends JsonDeserializer[MoveType]:
       case "enPassant"       => MoveType.EnPassant
       case "promotion"       => MoveType.Promotion(PromotionPiece.valueOf(node.get("piece").asText()))
       case t                 => throw new JsonParseException(p, s"Unknown move type: $t")
+  // scalafix:on DisableSyntax.throw

modules/rule/src/test/scala/de/nowchess/rules/json/JsonSerializersTest.scala

@@ -32,11 +32,13 @@ class JsonSerializersTest extends AnyFunSuite with Matchers:
 
   // ── SquareKeyDeserializer ─────────────────────────────────────────
 
+  // scalafix:off DisableSyntax.null
   test("SquareKeyDeserializer returns square for valid key"):
     new SquareKeyDeserializer().deserializeKey("e4", null) shouldBe e4
 
   test("SquareKeyDeserializer returns null for invalid key"):
     new SquareKeyDeserializer().deserializeKey("z9", null) shouldBe null
+  // scalafix:on DisableSyntax.null
 
   // ── SquareSerializer/Deserializer ─────────────────────────────────
 
@@ -46,8 +48,10 @@ class JsonSerializersTest extends AnyFunSuite with Matchers:
   test("SquareDeserializer reads valid square string"):
     mapper.readValue(""""e4"""", classOf[Square]) shouldBe e4
 
+  // scalafix:off DisableSyntax.null
   test("SquareDeserializer returns null for invalid square string"):
     mapper.readValue(""""z9"""", classOf[Square]) shouldBe null
+  // scalafix:on DisableSyntax.null
 
   // ── MoveTypeSerializer ────────────────────────────────────────────