Port the DeepSeek, Perplexity, and xAI families

app/MindWork AI Studio/Models/Perplexity/SonarFamily.cs

@@ -0,0 +1,36 @@
+using static AIStudio.Provider.Capability;
+
+namespace AIStudio.Models.Perplexity;
+
+/// <summary>
+/// Sonar, the Perplexity models which search the web before they answer.
+/// </summary>
+/// <remarks>
+/// Searching is what they are, not something they can be asked to do, so every one of them states
+/// it. What differs is only whether the model thinks as well.
+///
+/// No Sonar writes images. What looks like it does is the option to have the answer come with
+/// pictures: those are images the search found on the pages it read, handed back as links, and
+/// reporting that as an output modality would have the chat wait for pictures which never arrive.
+/// </remarks>
+public sealed class SonarFamily : ModelFamily
+{
+    /// <inheritdoc />
+    public override ModelVendor Vendor => ModelVendor.PERPLEXITY;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://docs.perplexity.ai/getting-started/models", new DateOnly(2026, 9, 11), "Ported unchanged from the rules in ProviderExtensions.Perplexity.cs: images in, web search always, thinking for the reasoning and research models.");
+
+    /// <inheritdoc />
+    protected override void Declare(ModelFamilyBuilder builder)
+    {
+        builder.Rule("sonar").AsSegment()
+            .Capabilities(TEXT_INPUT | MULTIPLE_IMAGE_INPUT | TEXT_OUTPUT | WEB_SEARCH)
+            .Apis(CHAT_COMPLETION_API);
+
+        builder.Rule("sonar").AsSegment().AlsoContains("reasoning").Inherits()
+            .Reasoning(ReasoningSupport.ALWAYS);
+
+        builder.Rule("sonar").AsSegment().AlsoContains("deep-research").Inherits();
+    }
+}