Move the model kinds into the rule engine

app/MindWork AI Studio/Models/Kinds/OcrModelsFamily.cs

@@ -0,0 +1,23 @@
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Kinds;
+
+/// <summary>
+/// The models which read text off a page.
+/// </summary>
+/// <remarks>
+/// A document goes in and its text comes out. There is no conversation in them, so they answer a
+/// chat completion request with an error rather than with a reply.
+/// </remarks>
+public sealed class OcrModelsFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.UNKNOWN;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://docs.mistral.ai/capabilities/OCR/basic_ocr/", new DateOnly(2026, 9, 12), "Ported unchanged from the OCR marker of Provider/ModelKindExtensions.cs.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder) =>
+        builder.Modifier("ocr").AsSubstring().Kind(ModelKind.OCR);
+}