Read model capabilities from the profile everywhere

app/Tests/Chat/ListContentBlockExtensionsTests.cs

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+using AIStudio.Chat;
+using AIStudio.Provider;
+using AIStudio.Provider.OpenAI;
+
+namespace AIStudio.Tests.Chat;
+
+/// <summary>
+/// Checks that writing a message asks the same question as attaching the picture did.
+/// </summary>
+/// <remarks>
+/// These were two questions until now. Attaching a file asked the configured provider, so a person's
+/// expert settings counted; building the message asked the automatic answer alone, so they did not.
+/// Somebody who switched image input on for their own installation watched the picture attach and
+/// then watched it disappear on the way to the model -- every chat round and every tool round, with
+/// nothing anywhere saying why.
+/// </remarks>
+[TestFixture]
+public sealed class ListContentBlockExtensionsTests
+{
+    [Test]
+    public async Task ImageInputSwitchedOnByHandReachesTheMessageAsWell()
+    {
+        var provider = new AIStudio.Settings.Provider(0, "test", "Test", LLMProviders.SELF_HOSTED, new Model("llama3.3:70b", null))
+        {
+            // The rules say this model reads text only, which is what makes it the right model here:
+            CapabilityOverrides = new() { MultipleImageInput = true },
+        };
+
+        var messages = await BlocksWithAPicture().BuildMessagesAsync(provider, _ => "user", Text, Picture);
+
+        Assert.That(messages.Single(), Is.InstanceOf<MultimodalMessage>(), "The picture is part of the message because the person said this model can read one.");
+    }
+
+    [Test]
+    public async Task WithoutThatSwitchThePictureStaysOut()
+    {
+        var provider = new AIStudio.Settings.Provider(0, "test", "Test", LLMProviders.SELF_HOSTED, new Model("llama3.3:70b", null));
+
+        var messages = await BlocksWithAPicture().BuildMessagesAsync(provider, _ => "user", Text, Picture);
+
+        Assert.That(messages.Single(), Is.InstanceOf<TextMessage>(), "Nothing says this model reads pictures, so the text goes on its own.");
+    }
+
+    /// <summary>
+    /// One block of text with a picture hanging on it.
+    /// </summary>
+    /// <returns>The blocks.</returns>
+    private static List<ContentBlock> BlocksWithAPicture() =>
+    [
+        new()
+        {
+            Role = ChatRole.USER,
+            ContentType = ContentType.TEXT,
+            Content = new ContentText
+            {
+                Text = "What is in this picture?",
+                FileAttachments = [new FileAttachmentImage("picture.png", "/tmp/picture.png", 1_024)],
+            },
+        },
+    ];
+
+    private static ISubContent Text(string text) => new SubContentText { Text = text };
+
+    private static Task<ISubContent> Picture(FileAttachmentImage image) => Task.FromResult<ISubContent>(new SubContentText { Text = image.FileName });
+}