feat(mcp) : add business tools — search, history, comments, custom fields, documents, model types

- search_inventory: global search across all 6 entity types
- get_entity_history + get_activity_log: audit trail access
- 4 comment tools: list, create, resolve, unresolved count
- 3 custom field tools: list values, upsert, delete
- 2 document tools: list, delete (upload via REST only)
- 6 model type tools: list, get, create, update, delete, sync
- 69 MCP tests pass total

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

src/Mcp/Tool/Comment/UnresolvedCountTool.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Comment;
+
+use App\Entity\Comment;
+use App\Mcp\Tool\McpToolHelper;
+use Doctrine\ORM\EntityManagerInterface;
+use Mcp\Capability\Attribute\McpTool;
+
+#[McpTool(
+    name: 'get_unresolved_comments_count',
+    description: 'Get the total count of unresolved (open) comments across all entities.',
+)]
+class UnresolvedCountTool
+{
+    use McpToolHelper;
+
+    public function __construct(
+        private readonly EntityManagerInterface $em,
+    ) {}
+
+    public function __invoke(): array
+    {
+        $count = (int) $this->em->getRepository(Comment::class)
+            ->createQueryBuilder('c')
+            ->select('COUNT(c.id)')
+            ->andWhere('c.status = :status')
+            ->setParameter('status', 'open')
+            ->getQuery()
+            ->getSingleScalarResult()
+        ;
+
+        return $this->jsonResponse(['count' => $count]);
+    }
+}