Move the model kinds into the rule engine

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

@@ -0,0 +1,59 @@
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Kinds;
+
+/// <summary>
+/// The models which turn text into a vector, whoever built them.
+/// </summary>
+/// <remarks>
+/// Everything in this folder answers one question: what is a model made for, as opposed to what can
+/// it do. The two used to be answered by two different pieces of code walking the same name, and
+/// before that by every provider carrying a list of name fragments of its own -- lists which
+/// disagreed, so that nomic-embed-text was an embedding model at one provider and a chat model at
+/// the next.
+///
+/// These are modifiers rather than selectors, and that is the whole trick. A model keeps the family
+/// it belongs to and this only says what it is for: llama-guard stays a Llama, and an embedding
+/// checkpoint of a family we have rules for keeps those rules. Written as selectors they would have
+/// to win against the family, and "embed" against "llama" is a contest neither of them should be
+/// in -- both are five characters of substring, which is a tie, which is an error.
+///
+/// What none of them may become is a place for provider-specific knowledge. That "codestral" fills
+/// in the middle at Mistral is true for Mistral; such a statement belongs to the family.
+/// </remarks>
+public sealed class EmbeddingModelsFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.UNKNOWN;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://huggingface.co/models?pipeline_tag=feature-extraction", new DateOnly(2026, 9, 12), "Ported from the embedding markers of Provider/ModelKindExtensions.cs. The e5 line says it in its own family, so it is not repeated here.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder)
+    {
+        builder.Modifier("embed").AsSubstring().Kind(ModelKind.EMBEDDING);
+
+        builder.Modifier("bge").AsSubstring().Inherits();
+
+        builder.Modifier("mpnet").AsSubstring().Inherits();
+
+        builder.Modifier("paraphrase").AsSubstring().Inherits();
+
+        //
+        // The one marker which was really an organization rather than a model. It still holds where
+        // a name arrives whole, but the host takes the organization off before any rule sees the
+        // name, so the model this organization is known for has to stand next to it: all-MiniLM-L6-v2
+        // says nothing about embedding except through who published it.
+        //
+        builder.Modifier("sentence-transformers").AsSubstring().Inherits();
+
+        builder.Modifier("minilm").AsSubstring().Inherits();
+
+        builder.Modifier("gritlm").AsSubstring().Inherits();
+
+        // General Text Embeddings, from Alibaba. Written as a name part rather than as a substring,
+        // because three letters appear inside far too many unrelated words:
+        builder.Modifier("gte").AsSegment().Inherits();
+    }
+}