feat(mcp) : add Slots, Machine Links, Structure, and Clone tools

- list_slots + update_slots for composant/piece slots
- list/add/update/remove machine links (component, piece, product)
- get_machine_structure with full hierarchy
- clone_machine with all links and custom fields
- 52 MCP tests pass total

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

src/Mcp/Tool/Machine/RemoveMachineLinkTool.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Machine;
+
+use App\Mcp\Tool\McpToolHelper;
+use App\Repository\MachineComponentLinkRepository;
+use App\Repository\MachinePieceLinkRepository;
+use App\Repository\MachineProductLinkRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+
+#[McpTool(
+    name: 'remove_machine_link',
+    description: 'Remove a machine link by id and type (composant, piece, or product). Requires ROLE_GESTIONNAIRE.',
+)]
+class RemoveMachineLinkTool
+{
+    use McpToolHelper;
+
+    public function __construct(
+        private readonly EntityManagerInterface $em,
+        private readonly Security $security,
+        private readonly MachineComponentLinkRepository $componentLinks,
+        private readonly MachinePieceLinkRepository $pieceLinks,
+        private readonly MachineProductLinkRepository $productLinks,
+    ) {}
+
+    public function __invoke(string $linkId, string $linkType): array
+    {
+        $this->requireRole($this->security, 'ROLE_GESTIONNAIRE');
+
+        $link = match ($linkType) {
+            'composant' => $this->componentLinks->find($linkId),
+            'piece'     => $this->pieceLinks->find($linkId),
+            'product'   => $this->productLinks->find($linkId),
+            default     => $this->mcpError('Validation', "Unknown link type '{$linkType}'. Expected composant, piece, or product."),
+        };
+
+        if (null === $link) {
+            $this->mcpError('NotFound', "Link {$linkId} of type {$linkType} not found.");
+        }
+
+        $this->em->remove($link);
+        $this->em->flush();
+
+        return $this->jsonResponse(['deleted' => true, 'id' => $linkId, 'type' => $linkType]);
+    }
+}