Sorted every model list by what a model is made for (#984)

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

@@ -19,7 +19,7 @@ public sealed class TextCompletionModelsFamily : ModelFamily
     public override ModelVendor Vendor => ModelVendor.UNKNOWN;
 
     /// <inheritdoc />
-    public override ModelSource Source => new("https://platform.openai.com/docs/api-reference/completions", new DateOnly(2026, 9, 12), "Ported unchanged from the text completion markers of Provider/ModelKindExtensions.cs.");
+    public override ModelSource Source => new("https://platform.openai.com/docs/api-reference/completions", new DateOnly(2026, 9, 12), "Ported unchanged from the text completion markers of Provider/ModelKindExtensions.cs. Fill-in-the-middle came later, off Mistral's own catalog at https://api.mistral.ai/v1/models, read on 2026-09-19.");
 
     /// <inheritdoc />
     protected override void Declare(ModelFamilyBuilder builder)
@@ -32,5 +32,13 @@ public sealed class TextCompletionModelsFamily : ModelFamily
 
         // The one model of the 3.5 line which never learned to chat, next to the ones which did:
         builder.Modifier("gpt-3.5-turbo-instruct").AsSegment().Inherits();
+
+        //
+        // Fill in the middle: a model handed the code on either side of a gap rather than a
+        // conversation. Mistral writes it into the name of the one it serves for that,
+        // mistral-code-fim-latest, which stood in the chat list because nothing looked for the
+        // word. Codestral does the same job and says so through its family instead.
+        //
+        builder.Modifier("fim").AsSegment().Inherits();
     }
 }