Added a-frame-architecture usiung wolverine sample.

wolverine/a-frame-architecture/FinancialApi.Domain/Entities/Account.cs

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+using FinancialApi.Domain.Exceptions;
+
+namespace FinancialApi.Domain.Entities;
+
+public enum AccountType
+{
+    Spend,
+    Borrow,
+    Revenue
+}
+
+public record Account
+{
+    public Account(int Id, decimal Balance, AccountType Type)
+    {
+        this.Id = Id;
+        this.Balance = Balance;
+        this.Type = Type;
+
+        if (Balance < 0 && Type is AccountType.Spend or AccountType.Revenue)
+        {
+            throw new InvalidStartingBalanceException("Insufficient funds.");
+        }
+    }
+
+    public Account ApplyPosting(decimal amount, EntryType entryType)
+    {
+        if (amount <= 0)
+        {
+            throw new ArgumentException("Amount must be positive.");
+        }
+
+        var newBalance = entryType == EntryType.Credit ? Balance + amount : Balance - amount;
+
+        if (newBalance < 0 && Type is AccountType.Spend or AccountType.Revenue)
+        {
+            throw new InsufficientFundsException("Insufficient funds.");
+        }
+
+        return this with { Balance = newBalance };
+    }
+
+    public int Id { get; init; }
+    public decimal Balance { get; init; }
+    public AccountType Type { get; init; }
+
+    public void Deconstruct(out int Id, out decimal Balance, out AccountType Type)
+    {
+        Id = this.Id;
+        Balance = this.Balance;
+        Type = this.Type;
+    }
+}

wolverine/a-frame-architecture/FinancialApi.Domain/Entities/BalancedJournalEntry.cs

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+namespace FinancialApi.Domain.Entities;
+
+public record BalancedJournalEntry
+{
+    public Guid Id { get; init; }
+    public string Description { get; init; } = null!;
+    public DateTimeOffset CreatedAt { get; init; }
+    public List<JournalLine> Lines { get; init; } = [];
+
+    internal BalancedJournalEntry() { }
+    
+    internal BalancedJournalEntry(Guid id, string description, DateTimeOffset createdAt, List<JournalLine> lines)
+    {
+        Lines = lines;
+        Id = id;
+        Description = description;
+        CreatedAt = createdAt;
+    }
+}

wolverine/a-frame-architecture/FinancialApi.Domain/Entities/EntryType.cs

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+namespace FinancialApi.Domain.Entities;
+
+public enum EntryType
+{
+    Debit,
+    Credit
+}

wolverine/a-frame-architecture/FinancialApi.Domain/Entities/JournalLine.cs

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+namespace FinancialApi.Domain.Entities;
+
+public record JournalLine(int AccountId, decimal Amount, EntryType Type);