Nullable Reference Types

All projects MUST enable <Nullable>enable</Nullable>. Treat warnings as design signals — string means non-null, string? means nullable.

• The null-forgiving operator (!) SHOULD NOT be used — prefer ?? throw or guard clauses
• Use required properties and constructor parameters for non-null initialization
• Use [NotNull], [MaybeNull], [NotNullWhen] from System.Diagnostics.CodeAnalysis for contracts the compiler cannot infer

// Good: required + guard clause
public required string Name { get; init; }

public void Process(string? input)
{
    ArgumentNullException.ThrowIfNull(input);
    // input is now non-null
}

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