Port the Mistral families, including the release date logic

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

@@ -0,0 +1,25 @@
+using static AIStudio.Provider.Capability;
+
+namespace AIStudio.Models.Mistral;
+
+/// <summary>
+/// Mistral NeMo, the open model Mistral built with NVIDIA.
+/// </summary>
+/// <remarks>
+/// Mistral's own API serves it as "open-mistral-nemo", the hubs as "mistral-nemo". Whole name
+/// parts cover both, which is why nothing here cares which of the two arrived.
+/// </remarks>
+public sealed class MistralNemoFamily : 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.OpenSource.cs: text in, text out, tool calling.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder) =>
+        builder.Rule("mistral-nemo").AsSegment()
+            .Capabilities(TEXT_INPUT | TEXT_OUTPUT | FUNCTION_CALLING)
+            .Apis(CHAT_COMPLETION_API);
+}