Internal Release v0.1.1

- implement `Prompt`
- adjust Tool approach
- update readme for tool calling
- document usage of `Prompt`

test/model_context_protocol/prompt_test.rb

@@ -0,0 +1,51 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "test_helper"
+
+module ModelContextProtocol
+  class PromptTest < ActiveSupport::TestCase
+    test "#template validates arguments" do
+      prompt = Prompt.new(
+        name: "test_prompt",
+        description: "Test prompt",
+        arguments: [
+          Prompt::Argument.new(name: "test_argument", description: "Test argument", required: true),
+        ],
+      )
+      assert_raises(ArgumentError) do
+        prompt.template({})
+      end
+    end
+
+    test "#template returns a Result with description and messages when arguments are valid" do
+      prompt = Prompt.new(
+        name: "test_prompt",
+        description: "Test prompt",
+        arguments: [
+          Prompt::Argument.new(name: "test_argument", description: "Test argument", required: true),
+        ],
+      ) do |_|
+        Prompt::Result.new(
+          description: "Hello, world!",
+          messages: [
+            Prompt::Message.new(role: "user", content: Content::Text.new("Hello, world!")),
+            Prompt::Message.new(role: "assistant", content: Content::Text.new("Hello, friend!")),
+          ],
+        )
+      end
+
+      expected = {
+        description: "Hello, world!",
+        messages: [
+          { role: "user", content: { text: "Hello, world!" } },
+          { role: "assistant", content: { text: "Hello, friend!" } },
+        ],
+      }
+
+      result = prompt.template({ "test_argument" => "Hello, friend!" })
+
+      assert_equal expected, result.to_h
+    end
+  end
+end