Rebuilt how AI Studio knows what a model can do (#960)

app/MindWork AI Studio/Models/Google/GeminiImageFamily.cs

@@ -0,0 +1,42 @@
+using static AIStudio.Provider.Capability;
+
+namespace AIStudio.Models.Google;
+
+/// <summary>
+/// The Gemini models which draw as well as write.
+/// </summary>
+/// <remarks>
+/// They are named like every other Gemini, with a version and a size, and the only thing setting
+/// them apart is the name part "image". So the rules here are the generation rules of the chat
+/// family with that one part required on top, and requiring it is exactly what makes them win: two
+/// rules reaching equally far into a name are separated by how many conditions they carry.
+///
+/// What they can do is nearly the opposite of what their generation can. They write images, which
+/// no chat Gemini does, and they call no tools, which every chat Gemini does. Reading them as chat
+/// models of their line -- which is what happens when nobody asks about the image part first --
+/// promises tool calling that is not there.
+/// </remarks>
+public sealed class GeminiImageFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.GOOGLE;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://ai.google.dev/gemini-api/docs/image-generation", new DateOnly(2026, 9, 11), "Ported unchanged from the rules in ProviderExtensions.Google.cs: images out, no tool calling, and thinking from the 3 line on.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder)
+    {
+        builder.Rule("gemini-2.5").AsPrefix().AlsoContains("image")
+            .Capabilities(TEXT_INPUT | MULTIPLE_IMAGE_INPUT | TEXT_OUTPUT | IMAGE_OUTPUT)
+            .Apis(CHAT_COMPLETION_API);
+
+        // From the 3 line on they think about a complicated prompt, and it cannot be switched off:
+        builder.Rule("gemini-3").AsPrefix().AlsoContains("image").Inherits()
+            .Reasoning(ReasoningSupport.ALWAYS);
+
+        // Only the 3.1 Flash image models watch video:
+        builder.Rule("gemini-3.1").AsPrefix().AlsoContains("image").Inherits()
+            .Capabilities(VIDEO_INPUT);
+    }
+}