feat : add 22 MCP tool classes for projects, tasks, and time tracking

Tools: list-users, list-clients, list/get/create/update-project,
list/get/create/update/delete-task, list-statuses/priorities/efforts/tags,
list/create/update-group, list/create/update/delete-time-entry.

Attribute moved to class level for SDK discovery compatibility.
Install nyholm/psr7 for HTTP transport PSR-17 support.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Mcp/Tool/Reference/ListUsersTool.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Reference;
+
+use App\Repository\UserRepository;
+use Mcp\Capability\Attribute\McpTool;
+
+#[McpTool(name: 'list-users', description: 'List all users with their IDs and usernames. Use this to discover valid user IDs for assignee or time entry parameters.')]
+class ListUsersTool
+{
+    public function __construct(
+        private readonly UserRepository $userRepository,
+    ) {}
+
+    public function __invoke(): string
+    {
+        $users = $this->userRepository->findBy([], ['username' => 'ASC']);
+
+        return json_encode(array_map(fn ($user) => [
+            'id'       => $user->getId(),
+            'username' => $user->getUsername(),
+        ], $users));
+    }
+}