Introduce Capability Registry & Discovery

tests/Capability/Discovery/Fixtures/EnhancedCompletionHandler.php

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+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Tests\Capability\Discovery\Fixtures;
+
+use Mcp\Capability\Attribute\CompletionProvider;
+use Mcp\Capability\Attribute\McpPrompt;
+use Mcp\Capability\Attribute\McpResourceTemplate;
+use Mcp\Tests\Fixtures\Enum\PriorityEnum;
+use Mcp\Tests\Fixtures\Enum\StatusEnum;
+
+class EnhancedCompletionHandler
+{
+    /**
+     * Create content with list and enum completion providers.
+     */
+    #[McpPrompt(name: 'content_creator')]
+    public function createContent(
+        #[CompletionProvider(values: ['blog', 'article', 'tutorial', 'guide'])]
+        string $type,
+        #[CompletionProvider(enum: StatusEnum::class)]
+        string $status,
+        #[CompletionProvider(enum: PriorityEnum::class)]
+        string $priority,
+    ): array {
+        return [
+            ['role' => 'user', 'content' => "Create a {$type} with status {$status} and priority {$priority}"],
+        ];
+    }
+
+    /**
+     * Resource template with list completion for categories.
+     */
+    #[McpResourceTemplate(
+        uriTemplate: 'content://{category}/{slug}',
+        name: 'content_template'
+    )]
+    public function getContent(
+        #[CompletionProvider(values: ['news', 'blog', 'docs', 'api'])]
+        string $category,
+        string $slug,
+    ): array {
+        return [
+            'category' => $category,
+            'slug' => $slug,
+            'url' => "https://example.com/{$category}/{$slug}",
+        ];
+    }
+}