implemented step 05 by Gemini

added action saveConsent and ConsentService

src/Services/ConsentService.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use Exception;
+
+class ConsentService
+{
+	private FileStorage $storage;
+	private const CONSENT_VERSION = 'webwizard-mvp-2026-06-12';
+
+	public function __construct()
+	{
+		$this->storage = new FileStorage();
+	}
+
+	/**
+	 * Saves user consent for a specific project.
+	 */
+	public function saveConsent(string $projectId, string $userId, string $consentText): bool
+	{
+		// Verify project exists and belongs to user
+		$projectData = $this->storage->get("projects/{$projectId}.json");
+		if (!$projectData) {
+			throw new Exception("Project not found.", 404);
+		}
+		if ($projectData['user_id'] !== $userId) {
+			throw new Exception("Unauthorized access to project.", 403);
+		}
+
+		$consentData = [
+			'project_id' => $projectId,
+			'user_id' => $userId,
+			'consent_text_version' => self::CONSENT_VERSION,
+			'consent_text' => $consentText,
+			'accepted' => true,
+			'accepted_at' => gmdate('Y-m-d\TH:i:s\Z')
+		];
+
+		return $this->storage->put("consent/{$projectId}.json", $consentData);
+	}
+
+	/**
+	 * Checks if a project has a valid consent record.
+	 */
+	public function hasConsent(string $projectId): bool
+	{
+		return $this->storage->exists("consent/{$projectId}.json");
+	}
+
+	/**
+	 * Returns the current consent version.
+	 */
+	public function getVersion(): string
+	{
+		return self::CONSENT_VERSION;
+	}
+}