Port the Mistral families, including the release date logic

app/MindWork AI Studio/Models/Mistral/MistralSabaFamily.cs

@@ -0,0 +1,26 @@
+using static AIStudio.Provider.Capability;
+
+namespace AIStudio.Models.Mistral;
+
+/// <summary>
+/// Mistral Saba, the regional model for the Middle East and South Asia.
+/// </summary>
+/// <remarks>
+/// The one Mistral in this range which calls no tools at all. It needs its own rule for that
+/// reason alone: without it, the length of "mistral-small" and "mistral-large" would not matter,
+/// but the shape they share would be handed to a model which does not have it.
+/// </remarks>
+public sealed class MistralSabaFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.MISTRAL_AI;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://docs.mistral.ai/getting-started/models/models_overview/", new DateOnly(2026, 9, 11), "Ported unchanged from the rules in ProviderExtensions.Mistral.cs: text in, text out, and nothing else.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder) =>
+        builder.Rule("mistral-saba").AsSegment()
+            .Capabilities(TEXT_INPUT | TEXT_OUTPUT)
+            .Apis(CHAT_COMPLETION_API);
+}