feat: NCS-25 Add linters to keep quality up

modules/api/src/main/scala/de/nowchess/api/board/Board.scala

@@ -7,11 +7,11 @@ object Board:
   def apply(pieces: Map[Square, Piece]): Board = pieces
 
   extension (b: Board)
-    def pieceAt(sq: Square): Option[Piece] = b.get(sq)
+    def pieceAt(sq: Square): Option[Piece]       = b.get(sq)
     def updated(sq: Square, piece: Piece): Board = b.updated(sq, piece)
-    def removed(sq: Square): Board = b.removed(sq)
+    def removed(sq: Square): Board               = b.removed(sq)
     def withMove(from: Square, to: Square): (Board, Option[Piece]) =
-      val captured = b.get(to)
+      val captured     = b.get(to)
       val updatedBoard = b.removed(from).updated(to, b(from))
       (updatedBoard, captured)
     def applyMove(move: de.nowchess.api.move.Move): Board =
@@ -21,8 +21,14 @@ object Board:
 
   val initial: Board =
     val backRank: Vector[PieceType] = Vector(
-      PieceType.Rook, PieceType.Knight, PieceType.Bishop, PieceType.Queen,
-      PieceType.King, PieceType.Bishop, PieceType.Knight, PieceType.Rook
+      PieceType.Rook,
+      PieceType.Knight,
+      PieceType.Bishop,
+      PieceType.Queen,
+      PieceType.King,
+      PieceType.Bishop,
+      PieceType.Knight,
+      PieceType.Rook,
     )
     val entries = for
       fileIdx <- 0 until 8
@@ -30,7 +36,7 @@ object Board:
         (Color.White, Rank.R1, backRank(fileIdx)),
         (Color.White, Rank.R2, PieceType.Pawn),
         (Color.Black, Rank.R8, backRank(fileIdx)),
-        (Color.Black, Rank.R7, PieceType.Pawn)
+        (Color.Black, Rank.R7, PieceType.Pawn),
       )
     yield Square(File.values(fileIdx), rank) -> Piece(color, pieceType)
     Board(entries.toMap)

modules/api/src/main/scala/de/nowchess/api/board/CastlingRights.scala

@@ -1,50 +1,48 @@
 package de.nowchess.api.board
 
-/**
- * Unified castling rights tracker for all four sides.
- * Tracks whether castling is still available for each side and direction.
- *
- * @param whiteKingSide   White's king-side castling (0-0) still legally available
- * @param whiteQueenSide  White's queen-side castling (0-0-0) still legally available
- * @param blackKingSide   Black's king-side castling (0-0) still legally available
- * @param blackQueenSide  Black's queen-side castling (0-0-0) still legally available
- */
+/** Unified castling rights tracker for all four sides. Tracks whether castling is still available for each side and
+  * direction.
+  *
+  * @param whiteKingSide
+  *   White's king-side castling (0-0) still legally available
+  * @param whiteQueenSide
+  *   White's queen-side castling (0-0-0) still legally available
+  * @param blackKingSide
+  *   Black's king-side castling (0-0) still legally available
+  * @param blackQueenSide
+  *   Black's queen-side castling (0-0-0) still legally available
+  */
 final case class CastlingRights(
-  whiteKingSide: Boolean,
-  whiteQueenSide: Boolean,
-  blackKingSide: Boolean,
-  blackQueenSide: Boolean
+    whiteKingSide: Boolean,
+    whiteQueenSide: Boolean,
+    blackKingSide: Boolean,
+    blackQueenSide: Boolean,
 ):
-  /**
-   * Check if either side has any castling rights remaining.
-   */
+  /** Check if either side has any castling rights remaining.
+    */
   def hasAnyRights: Boolean =
     whiteKingSide || whiteQueenSide || blackKingSide || blackQueenSide
 
-  /**
-   * Check if a specific color has any castling rights remaining.
-   */
+  /** Check if a specific color has any castling rights remaining.
+    */
   def hasRights(color: Color): Boolean = color match
     case Color.White => whiteKingSide || whiteQueenSide
     case Color.Black => blackKingSide || blackQueenSide
 
-  /**
-   * Revoke all castling rights for a specific color.
-   */
+  /** Revoke all castling rights for a specific color.
+    */
   def revokeColor(color: Color): CastlingRights = color match
     case Color.White => copy(whiteKingSide = false, whiteQueenSide = false)
     case Color.Black => copy(blackKingSide = false, blackQueenSide = false)
 
-  /**
-   * Revoke a specific castling right.
-   */
+  /** Revoke a specific castling right.
+    */
   def revokeKingSide(color: Color): CastlingRights = color match
     case Color.White => copy(whiteKingSide = false)
     case Color.Black => copy(blackKingSide = false)
 
-  /**
-   * Revoke a specific castling right.
-   */
+  /** Revoke a specific castling right.
+    */
   def revokeQueenSide(color: Color): CastlingRights = color match
     case Color.White => copy(whiteQueenSide = false)
     case Color.Black => copy(blackQueenSide = false)
@@ -55,7 +53,7 @@ object CastlingRights:
     whiteKingSide = false,
     whiteQueenSide = false,
     blackKingSide = false,
-    blackQueenSide = false
+    blackQueenSide = false,
   )
 
   /** All castling rights available. */
@@ -63,7 +61,7 @@ object CastlingRights:
     whiteKingSide = true,
     whiteQueenSide = true,
     blackKingSide = true,
-    blackQueenSide = true
+    blackQueenSide = true,
   )
 
   /** Standard starting position castling rights (both sides can castle both ways). */

modules/api/src/main/scala/de/nowchess/api/board/Piece.scala

@@ -5,16 +5,16 @@ final case class Piece(color: Color, pieceType: PieceType)
 
 object Piece:
   // Convenience constructors
-  val WhitePawn:   Piece = Piece(Color.White, PieceType.Pawn)
+  val WhitePawn: Piece   = Piece(Color.White, PieceType.Pawn)
   val WhiteKnight: Piece = Piece(Color.White, PieceType.Knight)
   val WhiteBishop: Piece = Piece(Color.White, PieceType.Bishop)
-  val WhiteRook:   Piece = Piece(Color.White, PieceType.Rook)
-  val WhiteQueen:  Piece = Piece(Color.White, PieceType.Queen)
-  val WhiteKing:   Piece = Piece(Color.White, PieceType.King)
+  val WhiteRook: Piece   = Piece(Color.White, PieceType.Rook)
+  val WhiteQueen: Piece  = Piece(Color.White, PieceType.Queen)
+  val WhiteKing: Piece   = Piece(Color.White, PieceType.King)
 
-  val BlackPawn:   Piece = Piece(Color.Black, PieceType.Pawn)
+  val BlackPawn: Piece   = Piece(Color.Black, PieceType.Pawn)
   val BlackKnight: Piece = Piece(Color.Black, PieceType.Knight)
   val BlackBishop: Piece = Piece(Color.Black, PieceType.Bishop)
-  val BlackRook:   Piece = Piece(Color.Black, PieceType.Rook)
-  val BlackQueen:  Piece = Piece(Color.Black, PieceType.Queen)
-  val BlackKing:   Piece = Piece(Color.Black, PieceType.King)
+  val BlackRook: Piece   = Piece(Color.Black, PieceType.Rook)
+  val BlackQueen: Piece  = Piece(Color.Black, PieceType.Queen)
+  val BlackKing: Piece   = Piece(Color.Black, PieceType.King)

modules/api/src/main/scala/de/nowchess/api/board/Square.scala

@@ -1,43 +1,38 @@
 package de.nowchess.api.board
 
-/**
- * A file (column) on the chess board, a–h.
- * Ordinal values 0–7 correspond to a–h.
- */
+/** A file (column) on the chess board, a–h. Ordinal values 0–7 correspond to a–h.
+  */
 enum File:
   case A, B, C, D, E, F, G, H
 
-/**
- * A rank (row) on the chess board, 1–8.
- * Ordinal values 0–7 correspond to ranks 1–8.
- */
+/** A rank (row) on the chess board, 1–8. Ordinal values 0–7 correspond to ranks 1–8.
+  */
 enum Rank:
   case R1, R2, R3, R4, R5, R6, R7, R8
 
-/**
- * A unique square on the board, identified by its file and rank.
- *
- * @param file the column, a–h
- * @param rank the row, 1–8
- */
+/** A unique square on the board, identified by its file and rank.
+  *
+  * @param file
+  *   the column, a–h
+  * @param rank
+  *   the row, 1–8
+  */
 final case class Square(file: File, rank: Rank):
   /** Algebraic notation string, e.g. "e4". */
   override def toString: String =
     s"${file.toString.toLowerCase}${rank.ordinal + 1}"
 
 object Square:
-  /** Parse a square from algebraic notation (e.g. "e4").
-   *  Returns None if the input is not a valid square name. */
+  /** Parse a square from algebraic notation (e.g. "e4"). Returns None if the input is not a valid square name.
+    */
   def fromAlgebraic(s: String): Option[Square] =
     if s.length != 2 then None
     else
       val fileChar = s.charAt(0)
       val rankChar = s.charAt(1)
-      val fileOpt = File.values.find(_.toString.equalsIgnoreCase(fileChar.toString))
+      val fileOpt  = File.values.find(_.toString.equalsIgnoreCase(fileChar.toString))
       val rankOpt =
-        rankChar.toString.toIntOption.flatMap(n =>
-          if n >= 1 && n <= 8 then Some(Rank.values(n - 1)) else None
-        )
+        rankChar.toString.toIntOption.flatMap(n => if n >= 1 && n <= 8 then Some(Rank.values(n - 1)) else None)
       for f <- fileOpt; r <- rankOpt yield Square(f, r)
 
   val all: IndexedSeq[Square] =
@@ -46,12 +41,13 @@ object Square:
       f <- File.values.toIndexedSeq
     yield Square(f, r)
 
-  /** Compute a target square by offsetting file and rank.
-   *  Returns None if the resulting square is outside the board (0-7 range). */
+  /** Compute a target square by offsetting file and rank. Returns None if the resulting square is outside the board
+    * (0-7 range).
+    */
   extension (sq: Square)
     def offset(fileDelta: Int, rankDelta: Int): Option[Square] =
       val newFileOrd = sq.file.ordinal + fileDelta
       val newRankOrd = sq.rank.ordinal + rankDelta
       if newFileOrd >= 0 && newFileOrd < 8 && newRankOrd >= 0 && newRankOrd < 8 then
         Some(Square(File.values(newFileOrd), Rank.values(newRankOrd)))
-      else None
+      else None

modules/api/src/main/scala/de/nowchess/api/game/GameContext.scala

@@ -1,18 +1,17 @@
 package de.nowchess.api.game
 
-import de.nowchess.api.board.{Board, Color, Square, CastlingRights}
+import de.nowchess.api.board.{Board, CastlingRights, Color, Square}
 import de.nowchess.api.move.Move
 
-/** Immutable bundle of complete game state.
- *  All state changes produce new GameContext instances.
- */
+/** Immutable bundle of complete game state. All state changes produce new GameContext instances.
+  */
 case class GameContext(
-  board: Board,
-  turn: Color,
-  castlingRights: CastlingRights,
-  enPassantSquare: Option[Square],
-  halfMoveClock: Int,
-  moves: List[Move]
+    board: Board,
+    turn: Color,
+    castlingRights: CastlingRights,
+    enPassantSquare: Option[Square],
+    halfMoveClock: Int,
+    moves: List[Move],
 ):
   /** Create new context with updated board. */
   def withBoard(newBoard: Board): GameContext = copy(board = newBoard)
@@ -40,5 +39,5 @@ object GameContext:
     castlingRights = CastlingRights.Initial,
     enPassantSquare = None,
     halfMoveClock = 0,
-    moves = List.empty
+    moves = List.empty,
   )

modules/api/src/main/scala/de/nowchess/api/move/Move.scala

@@ -10,24 +10,30 @@ enum PromotionPiece:
 enum MoveType:
   /** A normal move or capture with no special rule. */
   case Normal(isCapture: Boolean = false)
+
   /** Kingside castling (O-O). */
   case CastleKingside
+
   /** Queenside castling (O-O-O). */
   case CastleQueenside
+
   /** En-passant pawn capture. */
   case EnPassant
+
   /** Pawn promotion; carries the chosen promotion piece. */
   case Promotion(piece: PromotionPiece)
 
-/**
- * A half-move (ply) in a chess game.
- *
- * @param from     origin square
- * @param to       destination square
- * @param moveType special semantics; defaults to Normal
- */
+/** A half-move (ply) in a chess game.
+  *
+  * @param from
+  *   origin square
+  * @param to
+  *   destination square
+  * @param moveType
+  *   special semantics; defaults to Normal
+  */
 final case class Move(
-  from: Square,
-  to: Square,
-  moveType: MoveType = MoveType.Normal()
+    from: Square,
+    to: Square,
+    moveType: MoveType = MoveType.Normal(),
 )

modules/api/src/main/scala/de/nowchess/api/player/PlayerInfo.scala

@@ -1,27 +1,26 @@
 package de.nowchess.api.player
 
-/**
- * An opaque player identifier.
- *
- * Wraps a plain String so that IDs are not accidentally interchanged with
- * other String values at compile time.
- */
+/** An opaque player identifier.
+  *
+  * Wraps a plain String so that IDs are not accidentally interchanged with other String values at compile time.
+  */
 opaque type PlayerId = String
 
 object PlayerId:
-  def apply(value: String): PlayerId = value
+  def apply(value: String): PlayerId         = value
   extension (id: PlayerId) def value: String = id
 
-/**
- * The minimal cross-service identity stub for a player.
- *
- * Full profile data (email, rating history, etc.) lives in the user-management
- * service.  Only what every service needs is held here.
- *
- * @param id          unique identifier
- * @param displayName human-readable name shown in the UI
- */
+/** The minimal cross-service identity stub for a player.
+  *
+  * Full profile data (email, rating history, etc.) lives in the user-management service. Only what every service needs
+  * is held here.
+  *
+  * @param id
+  *   unique identifier
+  * @param displayName
+  *   human-readable name shown in the UI
+  */
 final case class PlayerInfo(
-  id: PlayerId,
-  displayName: String
+    id: PlayerId,
+    displayName: String,
 )

modules/api/src/main/scala/de/nowchess/api/response/ApiResponse.scala

@@ -1,13 +1,12 @@
 package de.nowchess.api.response
 
-/**
- * A standardised envelope for every API response.
- *
- * Success and failure are modelled as subtypes so that callers
- * can pattern-match exhaustively.
- *
- * @tparam A the payload type for a successful response
- */
+/** A standardised envelope for every API response.
+  *
+  * Success and failure are modelled as subtypes so that callers can pattern-match exhaustively.
+  *
+  * @tparam A
+  *   the payload type for a successful response
+  */
 sealed trait ApiResponse[+A]
 
 object ApiResponse:
@@ -20,43 +19,49 @@ object ApiResponse:
   /** Convenience constructor for a single-error failure. */
   def error(err: ApiError): Failure = Failure(List(err))
 
-/**
- * A structured error descriptor.
- *
- * @param code    machine-readable error code (e.g. "INVALID_MOVE", "NOT_FOUND")
- * @param message human-readable explanation
- * @param field   optional field name when the error relates to a specific input
- */
+/** A structured error descriptor.
+  *
+  * @param code
+  *   machine-readable error code (e.g. "INVALID_MOVE", "NOT_FOUND")
+  * @param message
+  *   human-readable explanation
+  * @param field
+  *   optional field name when the error relates to a specific input
+  */
 final case class ApiError(
-  code: String,
-  message: String,
-  field: Option[String] = None
+    code: String,
+    message: String,
+    field: Option[String] = None,
 )
 
-/**
- * Pagination metadata for list responses.
- *
- * @param page       current 0-based page index
- * @param pageSize   number of items per page
- * @param totalItems total number of items across all pages
- */
+/** Pagination metadata for list responses.
+  *
+  * @param page
+  *   current 0-based page index
+  * @param pageSize
+  *   number of items per page
+  * @param totalItems
+  *   total number of items across all pages
+  */
 final case class Pagination(
-  page: Int,
-  pageSize: Int,
-  totalItems: Long
+    page: Int,
+    pageSize: Int,
+    totalItems: Long,
 ):
   def totalPages: Int =
     if pageSize <= 0 then 0
     else Math.ceil(totalItems.toDouble / pageSize).toInt
 
-/**
- * A paginated list response envelope.
- *
- * @param items      the items on the current page
- * @param pagination pagination metadata
- * @tparam A         the item type
- */
+/** A paginated list response envelope.
+  *
+  * @param items
+  *   the items on the current page
+  * @param pagination
+  *   pagination metadata
+  * @tparam A
+  *   the item type
+  */
 final case class PagedResponse[A](
-  items: List[A],
-  pagination: Pagination
+    items: List[A],
+    pagination: Pagination,
 )

modules/api/src/test/scala/de/nowchess/api/board/BoardTest.scala

@@ -22,9 +22,9 @@ class BoardTest extends AnyFunSuite with Matchers:
   }
 
   test("withMove returns captured piece when destination is occupied") {
-    val from = Square(File.A, Rank.R1)
-    val to   = Square(File.A, Rank.R8)
-    val b    = Board(Map(from -> Piece.WhiteRook, to -> Piece.BlackRook))
+    val from              = Square(File.A, Rank.R1)
+    val to                = Square(File.A, Rank.R8)
+    val b                 = Board(Map(from -> Piece.WhiteRook, to -> Piece.BlackRook))
     val (board, captured) = b.withMove(from, to)
     captured shouldBe Some(Piece.BlackRook)
     board.pieceAt(to) shouldBe Some(Piece.WhiteRook)
@@ -51,8 +51,14 @@ class BoardTest extends AnyFunSuite with Matchers:
 
   test("initial board white back rank") {
     val expectedBackRank = Vector(
-      PieceType.Rook, PieceType.Knight, PieceType.Bishop, PieceType.Queen,
-      PieceType.King, PieceType.Bishop, PieceType.Knight, PieceType.Rook
+      PieceType.Rook,
+      PieceType.Knight,
+      PieceType.Bishop,
+      PieceType.Queen,
+      PieceType.King,
+      PieceType.Bishop,
+      PieceType.Knight,
+      PieceType.Rook,
     )
     File.values.zipWithIndex.foreach { (file, i) =>
       Board.initial.pieceAt(Square(file, Rank.R1)) shouldBe
@@ -62,8 +68,14 @@ class BoardTest extends AnyFunSuite with Matchers:
 
   test("initial board black back rank") {
     val expectedBackRank = Vector(
-      PieceType.Rook, PieceType.Knight, PieceType.Bishop, PieceType.Queen,
-      PieceType.King, PieceType.Bishop, PieceType.Knight, PieceType.Rook
+      PieceType.Rook,
+      PieceType.Knight,
+      PieceType.Bishop,
+      PieceType.Queen,
+      PieceType.King,
+      PieceType.Bishop,
+      PieceType.Knight,
+      PieceType.Rook,
     )
     File.values.zipWithIndex.foreach { (file, i) =>
       Board.initial.pieceAt(Square(file, Rank.R8)) shouldBe
@@ -76,12 +88,11 @@ class BoardTest extends AnyFunSuite with Matchers:
     for
       rank <- emptyRanks
       file <- File.values
-    do
-      Board.initial.pieceAt(Square(file, rank)) shouldBe None
+    do Board.initial.pieceAt(Square(file, rank)) shouldBe None
   }
 
   test("updated adds and replaces piece at squares") {
-    val b = Board(Map(e2 -> Piece.WhitePawn))
+    val b     = Board(Map(e2 -> Piece.WhitePawn))
     val added = b.updated(e4, Piece.WhiteKnight)
     added.pieceAt(e2) shouldBe Some(Piece.WhitePawn)
     added.pieceAt(e4) shouldBe Some(Piece.WhiteKnight)
@@ -91,7 +102,7 @@ class BoardTest extends AnyFunSuite with Matchers:
   }
 
   test("removed deletes piece from board") {
-    val b = Board(Map(e2 -> Piece.WhitePawn, e4 -> Piece.WhiteKnight))
+    val b       = Board(Map(e2 -> Piece.WhitePawn, e4 -> Piece.WhiteKnight))
     val removed = b.removed(e2)
     removed.pieceAt(e2) shouldBe None
     removed.pieceAt(e4) shouldBe Some(Piece.WhiteKnight)
@@ -105,4 +116,3 @@ class BoardTest extends AnyFunSuite with Matchers:
     moved.pieceAt(e4) shouldBe Some(Piece.WhitePawn)
     moved.pieceAt(e2) shouldBe None
   }
-

modules/api/src/test/scala/de/nowchess/api/board/CastlingRightsTest.scala

@@ -10,7 +10,7 @@ class CastlingRightsTest extends AnyFunSuite with Matchers:
       whiteKingSide = true,
       whiteQueenSide = false,
       blackKingSide = false,
-      blackQueenSide = true
+      blackQueenSide = true,
     )
 
     rights.hasAnyRights shouldBe true
@@ -54,4 +54,3 @@ class CastlingRightsTest extends AnyFunSuite with Matchers:
     val blackQueenSideRevoked = all.revokeQueenSide(Color.Black)
     blackQueenSideRevoked.blackKingSide shouldBe true
     blackQueenSideRevoked.blackQueenSide shouldBe false
-

modules/api/src/test/scala/de/nowchess/api/board/ColorTest.scala

@@ -8,7 +8,7 @@ class ColorTest extends AnyFunSuite with Matchers:
   test("Color values expose opposite and label consistently"):
     val cases = List(
       (Color.White, Color.Black, "White"),
-      (Color.Black, Color.White, "Black")
+      (Color.Black, Color.White, "Black"),
     )
 
     cases.foreach { (color, opposite, label) =>

modules/api/src/test/scala/de/nowchess/api/board/PieceTest.scala

@@ -7,24 +7,24 @@ class PieceTest extends AnyFunSuite with Matchers:
 
   test("Piece holds color and pieceType") {
     val p = Piece(Color.White, PieceType.Queen)
-    p.color    shouldBe Color.White
+    p.color shouldBe Color.White
     p.pieceType shouldBe PieceType.Queen
   }
 
   test("all convenience constants map to expected color and piece type") {
     val expected = List(
-      Piece.WhitePawn -> Piece(Color.White, PieceType.Pawn),
+      Piece.WhitePawn   -> Piece(Color.White, PieceType.Pawn),
       Piece.WhiteKnight -> Piece(Color.White, PieceType.Knight),
       Piece.WhiteBishop -> Piece(Color.White, PieceType.Bishop),
-      Piece.WhiteRook -> Piece(Color.White, PieceType.Rook),
-      Piece.WhiteQueen -> Piece(Color.White, PieceType.Queen),
-      Piece.WhiteKing -> Piece(Color.White, PieceType.King),
-      Piece.BlackPawn -> Piece(Color.Black, PieceType.Pawn),
+      Piece.WhiteRook   -> Piece(Color.White, PieceType.Rook),
+      Piece.WhiteQueen  -> Piece(Color.White, PieceType.Queen),
+      Piece.WhiteKing   -> Piece(Color.White, PieceType.King),
+      Piece.BlackPawn   -> Piece(Color.Black, PieceType.Pawn),
       Piece.BlackKnight -> Piece(Color.Black, PieceType.Knight),
       Piece.BlackBishop -> Piece(Color.Black, PieceType.Bishop),
-      Piece.BlackRook -> Piece(Color.Black, PieceType.Rook),
-      Piece.BlackQueen -> Piece(Color.Black, PieceType.Queen),
-      Piece.BlackKing -> Piece(Color.Black, PieceType.King)
+      Piece.BlackRook   -> Piece(Color.Black, PieceType.Rook),
+      Piece.BlackQueen  -> Piece(Color.Black, PieceType.Queen),
+      Piece.BlackKing   -> Piece(Color.Black, PieceType.King),
     )
 
     expected.foreach { case (actual, wanted) =>

modules/api/src/test/scala/de/nowchess/api/board/PieceTypeTest.scala

@@ -7,12 +7,12 @@ class PieceTypeTest extends AnyFunSuite with Matchers:
 
   test("PieceType values expose the expected labels"):
     val expectedLabels = List(
-      PieceType.Pawn -> "Pawn",
+      PieceType.Pawn   -> "Pawn",
       PieceType.Knight -> "Knight",
       PieceType.Bishop -> "Bishop",
-      PieceType.Rook -> "Rook",
-      PieceType.Queen -> "Queen",
-      PieceType.King -> "King"
+      PieceType.Rook   -> "Rook",
+      PieceType.Queen  -> "Queen",
+      PieceType.King   -> "King",
     )
 
     expectedLabels.foreach { (pieceType, expectedLabel) =>

modules/api/src/test/scala/de/nowchess/api/board/SquareTest.scala

@@ -16,7 +16,7 @@ class SquareTest extends AnyFunSuite with Matchers:
       "a1" -> Square(File.A, Rank.R1),
       "e4" -> Square(File.E, Rank.R4),
       "h8" -> Square(File.H, Rank.R8),
-      "E4" -> Square(File.E, Rank.R4)
+      "E4" -> Square(File.E, Rank.R4),
     )
     expected.foreach { case (raw, sq) =>
       Square.fromAlgebraic(raw) shouldBe Some(sq)
@@ -34,4 +34,3 @@ class SquareTest extends AnyFunSuite with Matchers:
     Square(File.A, Rank.R1).offset(-1, 0) shouldBe None
     Square(File.H, Rank.R8).offset(0, 1) shouldBe None
   }
-

modules/api/src/test/scala/de/nowchess/api/game/GameContextTest.scala

@@ -18,9 +18,9 @@ class GameContextTest extends AnyFunSuite with Matchers:
     initial.moves shouldBe List.empty
 
   test("withBoard updates only board"):
-    val square = Square(File.E, Rank.R4)
+    val square       = Square(File.E, Rank.R4)
     val updatedBoard = Board.initial.updated(square, de.nowchess.api.board.Piece.WhiteQueen)
-    val updated = GameContext.initial.withBoard(updatedBoard)
+    val updated      = GameContext.initial.withBoard(updatedBoard)
     updated.board shouldBe updatedBoard
     updated.turn shouldBe GameContext.initial.turn
     updated.castlingRights shouldBe GameContext.initial.castlingRights
@@ -34,13 +34,13 @@ class GameContextTest extends AnyFunSuite with Matchers:
       whiteKingSide = true,
       whiteQueenSide = false,
       blackKingSide = false,
-      blackQueenSide = true
+      blackQueenSide = true,
     )
-    val square = Some(Square(File.E, Rank.R3))
-    val updatedTurn = initial.withTurn(Color.Black)
+    val square        = Some(Square(File.E, Rank.R3))
+    val updatedTurn   = initial.withTurn(Color.Black)
     val updatedRights = initial.withCastlingRights(rights)
-    val updatedEp = initial.withEnPassantSquare(square)
-    val updatedClock = initial.withHalfMoveClock(17)
+    val updatedEp     = initial.withEnPassantSquare(square)
+    val updatedClock  = initial.withHalfMoveClock(17)
 
     updatedTurn.turn shouldBe Color.Black
     updatedTurn.board shouldBe initial.board
@@ -57,4 +57,3 @@ class GameContextTest extends AnyFunSuite with Matchers:
   test("withMove appends move to history"):
     val move = Move(Square(File.E, Rank.R2), Square(File.E, Rank.R4))
     GameContext.initial.withMove(move).moves shouldBe List(move)
-

modules/api/src/test/scala/de/nowchess/api/move/MoveTest.scala

@@ -25,7 +25,7 @@ class MoveTest extends AnyFunSuite with Matchers:
       MoveType.Promotion(PromotionPiece.Queen),
       MoveType.Promotion(PromotionPiece.Rook),
       MoveType.Promotion(PromotionPiece.Bishop),
-      MoveType.Promotion(PromotionPiece.Knight)
+      MoveType.Promotion(PromotionPiece.Knight),
     )
 
     moveTypes.foreach { moveType =>

modules/api/src/test/scala/de/nowchess/api/player/PlayerInfoTest.scala

@@ -7,12 +7,12 @@ class PlayerInfoTest extends AnyFunSuite with Matchers:
 
   test("PlayerId and PlayerInfo preserve constructor values") {
     val raw = "player-123"
-    val id = PlayerId(raw)
+    val id  = PlayerId(raw)
 
     id.value shouldBe raw
 
     val playerId = PlayerId("p1")
-    val info = PlayerInfo(playerId, "Magnus")
-    info.id.value      shouldBe "p1"
-    info.displayName   shouldBe "Magnus"
+    val info     = PlayerInfo(playerId, "Magnus")
+    info.id.value shouldBe "p1"
+    info.displayName shouldBe "Magnus"
   }

modules/api/src/test/scala/de/nowchess/api/response/ApiResponseTest.scala

@@ -14,9 +14,9 @@ class ApiResponseTest extends AnyFunSuite with Matchers:
     ApiResponse.error(err) shouldBe ApiResponse.Failure(List(err))
 
     val e = ApiError("CODE", "message")
-    e.code    shouldBe "CODE"
+    e.code shouldBe "CODE"
     e.message shouldBe "message"
-    e.field   shouldBe None
+    e.field shouldBe None
     ApiError("INVALID", "bad value", Some("email")).field shouldBe Some("email")
   }
 
@@ -31,6 +31,6 @@ class ApiResponseTest extends AnyFunSuite with Matchers:
   test("PagedResponse holds items and pagination") {
     val pagination = Pagination(page = 1, pageSize = 5, totalItems = 20)
     val pr         = PagedResponse(List("a", "b"), pagination)
-    pr.items      shouldBe List("a", "b")
+    pr.items shouldBe List("a", "b")
     pr.pagination shouldBe pagination
   }