refactor(domain): introduce UserFactory and WorkplaceFactory for reconstitution

Consistent with ReservationFactory — moves Reconstitute out of the entity
into a dedicated factory class, and makes the reconstitution constructor
internal to restrict direct instantiation to within the domain assembly.
Adds unit tests for all three factories.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/backend/src/Randall.Domain/Users/User.cs

@@ -10,10 +10,7 @@ public class User : Entity
     public bool IsApproved { get; private set; }
     public bool IsAdmin { get; private set; }
 
-    public static User Reconstitute(Guid id, string email, string name, string passwordHash, bool isApproved, bool isAdmin) =>
-        new(id, email, name, passwordHash, isApproved, isAdmin);
-
-    private User(Guid id, string email, string name, string passwordHash, bool isApproved, bool isAdmin) : base(id)
+    internal User(Guid id, string email, string name, string passwordHash, bool isApproved, bool isAdmin) : base(id)
     {
         Email = email;
         Name = name;

src/backend/src/Randall.Domain/Users/UserFactory.cs

@@ -0,0 +1,7 @@
+namespace Randall.Domain.Users;
+
+public static class UserFactory
+{
+    public static User Reconstitute(Guid id, string email, string name, string passwordHash, bool isApproved, bool isAdmin) =>
+        new(id, email, name, passwordHash, isApproved, isAdmin);
+}

src/backend/src/Randall.Domain/Workplaces/Workplace.cs

@@ -8,10 +8,7 @@ public class Workplace : Entity
     public string Location { get; private set; }
     public bool IsActive { get; private set; }
 
-    public static Workplace Reconstitute(Guid id, string name, string location, bool isActive) =>
-        new(id, name, location, isActive);
-
-    private Workplace(Guid id, string name, string location, bool isActive) : base(id)
+    internal Workplace(Guid id, string name, string location, bool isActive) : base(id)
     {
         Name = name;
         Location = location;

src/backend/src/Randall.Domain/Workplaces/WorkplaceFactory.cs

@@ -0,0 +1,7 @@
+namespace Randall.Domain.Workplaces;
+
+public static class WorkplaceFactory
+{
+    public static Workplace Reconstitute(Guid id, string name, string location, bool isActive) =>
+        new(id, name, location, isActive);
+}

src/backend/src/Randall.Infrastructure/Persistence/Mappers/UserMapper.cs

@@ -6,7 +6,7 @@ namespace Randall.Infrastructure.Persistence.Mappers;
 public static class UserMapper
 {
     public static User ToDomain(UserRecord record) =>
-        User.Reconstitute(
+        UserFactory.Reconstitute(
             record.Id,
             record.Email,
             record.Name,

src/backend/src/Randall.Infrastructure/Persistence/Mappers/WorkplaceMapper.cs

@@ -6,7 +6,7 @@ namespace Randall.Infrastructure.Persistence.Mappers;
 public static class WorkplaceMapper
 {
     public static Workplace ToDomain(WorkplaceRecord record) =>
-        Workplace.Reconstitute(
+        WorkplaceFactory.Reconstitute(
             record.Id,
             record.Name,
             record.Location,

src/backend/tests/unit/Randall.Domain.UnitTests/Reservations/ReservationFactoryTests.cs

@@ -0,0 +1,61 @@
+using Randall.Domain.Reservations;
+
+namespace Randall.Domain.UnitTests.Reservations;
+
+public class ReservationFactoryTests
+{
+    private static readonly Guid Id = Guid.NewGuid();
+    private static readonly Guid WorkplaceId = Guid.NewGuid();
+    private const string Email = "jane@company.com";
+    private const string Name = "Jane Smith";
+    private static readonly DateOnly Date = new(2026, 6, 1);
+    private static readonly DateTime CreatedAt = new(2026, 5, 1, 12, 0, 0, DateTimeKind.Utc);
+
+    [Fact]
+    public void Reconstitute_MapsAllFieldsExactly()
+    {
+        var reservation = ReservationFactory.Reconstitute(Id, WorkplaceId, Email, Name, Date, ReservationStatus.Active, CreatedAt);
+
+        Assert.Equal(Id, reservation.Id);
+        Assert.Equal(WorkplaceId, reservation.WorkplaceId);
+        Assert.Equal(Email, reservation.EmployeeEmail);
+        Assert.Equal(Name, reservation.EmployeeName);
+        Assert.Equal(Date, reservation.Date);
+        Assert.Equal(ReservationStatus.Active, reservation.Status);
+        Assert.Equal(CreatedAt, reservation.CreatedAt);
+    }
+
+    [Fact]
+    public void Reconstitute_PreservesProvidedId()
+    {
+        var reservation = ReservationFactory.Reconstitute(Id, WorkplaceId, Email, Name, Date, ReservationStatus.Active, CreatedAt);
+
+        Assert.Equal(Id, reservation.Id);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreActiveReservation()
+    {
+        var reservation = ReservationFactory.Reconstitute(Id, WorkplaceId, Email, Name, Date, ReservationStatus.Active, CreatedAt);
+
+        Assert.Equal(ReservationStatus.Active, reservation.Status);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreCancelledReservation()
+    {
+        var reservation = ReservationFactory.Reconstitute(Id, WorkplaceId, Email, Name, Date, ReservationStatus.Cancelled, CreatedAt);
+
+        Assert.Equal(ReservationStatus.Cancelled, reservation.Status);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestorePastReservation()
+    {
+        var pastDate = new DateOnly(2020, 1, 1);
+
+        var reservation = ReservationFactory.Reconstitute(Id, WorkplaceId, Email, Name, pastDate, ReservationStatus.Active, CreatedAt);
+
+        Assert.Equal(pastDate, reservation.Date);
+    }
+}

src/backend/tests/unit/Randall.Domain.UnitTests/Users/UserFactoryTests.cs

@@ -0,0 +1,58 @@
+using Randall.Domain.Users;
+
+namespace Randall.Domain.UnitTests.Users;
+
+public class UserFactoryTests
+{
+    private static readonly Guid Id = Guid.NewGuid();
+    private const string Email = "jane@company.com";
+    private const string Name = "Jane Smith";
+    private const string PasswordHash = "hashed-password";
+
+    [Fact]
+    public void Reconstitute_MapsAllFieldsExactly()
+    {
+        var user = UserFactory.Reconstitute(Id, Email, Name, PasswordHash, isApproved: true, isAdmin: false);
+
+        Assert.Equal(Id, user.Id);
+        Assert.Equal(Email, user.Email);
+        Assert.Equal(Name, user.Name);
+        Assert.Equal(PasswordHash, user.PasswordHash);
+        Assert.True(user.IsApproved);
+        Assert.False(user.IsAdmin);
+    }
+
+    [Fact]
+    public void Reconstitute_PreservesProvidedId()
+    {
+        var user = UserFactory.Reconstitute(Id, Email, Name, PasswordHash, isApproved: false, isAdmin: false);
+
+        Assert.Equal(Id, user.Id);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreApprovedNonAdminUser()
+    {
+        var user = UserFactory.Reconstitute(Id, Email, Name, PasswordHash, isApproved: true, isAdmin: false);
+
+        Assert.True(user.IsApproved);
+        Assert.False(user.IsAdmin);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreUnapprovedUser()
+    {
+        var user = UserFactory.Reconstitute(Id, Email, Name, PasswordHash, isApproved: false, isAdmin: false);
+
+        Assert.False(user.IsApproved);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreAdminUser()
+    {
+        var user = UserFactory.Reconstitute(Id, Email, Name, PasswordHash, isApproved: true, isAdmin: true);
+
+        Assert.True(user.IsAdmin);
+        Assert.True(user.IsApproved);
+    }
+}

src/backend/tests/unit/Randall.Domain.UnitTests/Workplaces/WorkplaceFactoryTests.cs

@@ -0,0 +1,45 @@
+using Randall.Domain.Workplaces;
+
+namespace Randall.Domain.UnitTests.Workplaces;
+
+public class WorkplaceFactoryTests
+{
+    private static readonly Guid Id = Guid.NewGuid();
+    private const string Name = "D13";
+    private const string Location = "Pod A";
+
+    [Fact]
+    public void Reconstitute_MapsAllFieldsExactly()
+    {
+        var workplace = WorkplaceFactory.Reconstitute(Id, Name, Location, isActive: true);
+
+        Assert.Equal(Id, workplace.Id);
+        Assert.Equal(Name, workplace.Name);
+        Assert.Equal(Location, workplace.Location);
+        Assert.True(workplace.IsActive);
+    }
+
+    [Fact]
+    public void Reconstitute_PreservesProvidedId()
+    {
+        var workplace = WorkplaceFactory.Reconstitute(Id, Name, Location, isActive: true);
+
+        Assert.Equal(Id, workplace.Id);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreActiveWorkplace()
+    {
+        var workplace = WorkplaceFactory.Reconstitute(Id, Name, Location, isActive: true);
+
+        Assert.True(workplace.IsActive);
+    }
+
+    [Fact]
+    public void Reconstitute_CanRestoreInactiveWorkplace()
+    {
+        var workplace = WorkplaceFactory.Reconstitute(Id, Name, Location, isActive: false);
+
+        Assert.False(workplace.IsActive);
+    }
+}