squash a bunch of commits

Shogi.Contracts/Api/Commands/CreateGuestTokenResponse.cs

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+using System;
+
+namespace Shogi.Contracts.Api;
+
+  public class CreateGuestTokenResponse
+  {
+      public string UserId { get; }
+      public string DisplayName { get; }
+      public Guid OneTimeToken { get; }
+
+      public CreateGuestTokenResponse(string userId, string displayName, Guid oneTimeToken)
+      {
+          UserId = userId;
+          DisplayName = displayName;
+          OneTimeToken = oneTimeToken;
+      }
+  }

Shogi.Contracts/Api/Commands/CreateSessionCommand.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Shogi.Contracts.Api;
+
+public class CreateSessionCommand
+{
+    [Required]
+    public string Name { get; set; } = string.Empty;
+    public bool IsPrivate { get; set; }
+}

Shogi.Contracts/Api/Commands/CreateTokenResponse.cs

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+using System;
+
+namespace Shogi.Contracts.Api;
+
+  public class CreateTokenResponse
+  {
+      public Guid OneTimeToken { get; }
+
+      public CreateTokenResponse(Guid token)
+      {
+          OneTimeToken = token;
+      }
+  }

Shogi.Contracts/Api/Commands/MovePieceCommand.cs

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+using Shogi.Contracts.Types;
+using System.ComponentModel.DataAnnotations;
+
+namespace Shogi.Contracts.Api;
+
+  public class MovePieceCommand
+  {
+      [Required]
+      public Move Move { get; set; }
+  }

Shogi.Contracts/Api/Queries/ReadAllSessionsResponse.cs

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+using Shogi.Contracts.Types;
+using System.Collections.Generic;
+
+namespace Shogi.Contracts.Api;
+
+public class ReadAllSessionsResponse
+  {
+      public IList<SessionMetadata> PlayerHasJoinedSessions { get; set; }
+      public IList<SessionMetadata> AllOtherSessions { get; set; }
+  }

Shogi.Contracts/Api/Queries/ReadSessionResponse.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Contracts.Api;
+
+  public class ReadSessionResponse
+  {
+      public Session Session { get; set; }
+  }

Shogi.Contracts/Shogi.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <AnalysisLevel>5</AnalysisLevel>
+    <Nullable>enable</Nullable>
+    <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
+    <Title>Shogi Service Models</Title>
+    <Description>Contains DTOs use for http requests to Shogi backend services.</Description>
+  </PropertyGroup>
+
+</Project>

Shogi.Contracts/Socket/CreateGame.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Contracts.Socket;
+
+public class SessionCreatedSocketMessage : ISocketResponse
+{
+  public SocketAction Action { get; }
+  
+  public SessionCreatedSocketMessage()
+  {
+    Action = SocketAction.SessionCreated;
+  }
+}

Shogi.Contracts/Socket/ISocketRequest.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Contracts.Socket
+{
+  public interface ISocketRequest
+  {
+    SocketAction Action { get; }
+  }
+}

Shogi.Contracts/Socket/ISocketResponse.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Contracts.Socket;
+
+public interface ISocketResponse
+{
+  SocketAction Action { get; }
+}
+
+public class SocketResponse : ISocketResponse
+{
+  public SocketAction Action { get; set; }
+}

Shogi.Contracts/Socket/Move.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Contracts.Socket;
+
+public class MoveResponse : ISocketResponse
+{
+  public SocketAction Action { get; }
+  public string SessionName { get; set; } = string.Empty;
+  /// <summary>
+  /// The player that made the move.
+  /// </summary>
+  public string PlayerName { get; set; } = string.Empty;
+
+  public MoveResponse()
+  {
+    Action = SocketAction.PieceMoved;
+  }
+}

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
+  }
+}