Initial commit (history squashed)

src/StellaOps.Cryptography.Tests/PasswordHashOptionsTests.cs

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+using StellaOps.Cryptography;
+
+namespace StellaOps.Cryptography.Tests;
+
+public class PasswordHashOptionsTests
+{
+    [Fact]
+    public void Validate_DoesNotThrow_ForDefaults()
+    {
+        var options = new PasswordHashOptions();
+        options.Validate();
+    }
+
+    [Fact]
+    public void Validate_Throws_WhenMemoryInvalid()
+    {
+        var options = new PasswordHashOptions
+        {
+            MemorySizeInKib = 0
+        };
+
+        Assert.Throws<InvalidOperationException>(options.Validate);
+    }
+}

src/StellaOps.Cryptography.Tests/StellaOps.Cryptography.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\StellaOps.Cryptography\StellaOps.Cryptography.csproj" />
+  </ItemGroup>
+</Project>