add simplification steps

csharp-fp2/Infrastructure/InMemoryAccountRepository.cs

@@ -0,0 +1,25 @@
+using CsharpFp2.Domain;
+
+namespace CsharpFp2.Infrastructure;
+
+/// Simple in-memory repository for demonstration
+public class InMemoryAccountRepository : IAccountRepository
+{
+    private readonly Dictionary<Guid, Account> _accounts = new();
+
+    public Account? GetById(Guid id)
+    {
+        var found = _accounts.TryGetValue(id, out var account);
+        Console.WriteLine(found ? $"[Repo] Loaded account {id}" : $"[Repo] Account {id} not found");
+
+        return found ? account : null;
+    }
+
+    public void Save(Account account)
+    {
+        _accounts[account.Id] = account;
+        Console.WriteLine(
+            $"[Repo] Saved account {account.Id} with balance {account.Balance.Amount:0.00}"
+        );
+    }
+}