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/CustomField/DeleteCustomFieldValueTool.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\CustomField;
+
+use App\Entity\CustomFieldValue;
+use App\Mcp\Tool\McpToolHelper;
+use Doctrine\ORM\EntityManagerInterface;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+
+#[McpTool(
+    name: 'delete_custom_field_value',
+    description: 'Delete a custom field value by ID. Requires ROLE_GESTIONNAIRE.',
+)]
+class DeleteCustomFieldValueTool
+{
+    use McpToolHelper;
+
+    public function __construct(
+        private readonly EntityManagerInterface $em,
+        private readonly Security $security,
+    ) {}
+
+    public function __invoke(string $customFieldValueId): array
+    {
+        $this->requireRole($this->security, 'ROLE_GESTIONNAIRE');
+
+        $cfv = $this->em->getRepository(CustomFieldValue::class)->find($customFieldValueId);
+
+        if (null === $cfv) {
+            $this->mcpError('not_found', "CustomFieldValue not found: {$customFieldValueId}");
+        }
+
+        $this->em->remove($cfv);
+        $this->em->flush();
+
+        return $this->jsonResponse(['deleted' => true, 'id' => $customFieldValueId]);
+    }
+}