squash a bunch of commits

Shogi.Contracts/Types/BoardState.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Shogi.Contracts.Types
+{
+  public class BoardState
+  {
+    public Dictionary<string, Piece?> Board { get; set; } = new Dictionary<string, Piece?>();
+    public IReadOnlyCollection<Piece> Player1Hand { get; set; } = Array.Empty<Piece>();
+    public IReadOnlyCollection<Piece> Player2Hand { get; set; } = Array.Empty<Piece>();
+    public WhichPlayer? PlayerInCheck { get; set; }
+    public WhichPlayer WhoseTurn { get; set; }
+  }
+}

Shogi.Contracts/Types/Move.cs

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+namespace Shogi.Contracts.Types
+{
+  public class Move
+  {
+    public WhichPiece? PieceFromCaptured { get; set; }
+    /// <summary>Board position notation, like A3 or G1</summary>
+    public string? From { get; set; }
+    /// <summary>Board position notation, like A3 or G1</summary>
+    public string To { get; set; } = string.Empty;
+    public bool IsPromotion { get; set; }
+  }
+}

Shogi.Contracts/Types/Piece.cs

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+namespace Shogi.Contracts.Types
+{
+  public class Piece
+  {
+    public bool IsPromoted { get; set; }
+    public WhichPiece WhichPiece { get; set; }
+    public WhichPlayer Owner { get; set; }
+  }
+}

Shogi.Contracts/Types/Session.cs

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+namespace Shogi.Contracts.Types
+{
+	public class Session
+	{
+		public string Player1 { get; set; }
+		public string? Player2 { get; set; }
+		public string SessionName { get; set; }
+		public BoardState BoardState { get; set; }
+	}
+}

Shogi.Contracts/Types/SessionMetadata.cs

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+namespace Shogi.Contracts.Types
+{
+  public class SessionMetadata
+  {
+    public string Name { get; set; }
+    public int PlayerCount { get; set; }
+  }
+}

Shogi.Contracts/Types/SocketAction.cs

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+namespace Shogi.Contracts.Types
+{
+  public enum SocketAction
+  {
+    SessionCreated,
+    SessionJoined,
+    PieceMoved
+  }
+}

Shogi.Contracts/Types/User.cs

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+namespace Shogi.Contracts.Types
+{
+	public class User
+	{
+		public string Id { get; set; } = string.Empty;
+
+		public string Name { get; set; } = string.Empty;
+	}
+}

Shogi.Contracts/Types/WhichPerspective.cs

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+namespace Shogi.Contracts.Types
+{
+	public enum WhichPlayer
+	{
+		Player1,
+		Player2
+	}
+}

Shogi.Contracts/Types/WhichPiece.cs

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+namespace Shogi.Contracts.Types
+{
+  public enum WhichPiece
+  {
+    King,
+    GoldGeneral,
+    SilverGeneral,
+    Bishop,
+    Rook,
+    Knight,
+    Lance,
+    Pawn
+  }
+}