Add separate read-only ERP lager MCP

scripts/tests/erp_lager_mcp_tools_list_test.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/../../modules/erp/lager/mcp.php';
+
+function assert_test(bool $condition, string $message): void
+{
+    if (!$condition) {
+        fwrite(STDERR, $message . PHP_EOL);
+        exit(1);
+    }
+}
+
+$tools = erp_lager_mcp_tools();
+assert_test(count($tools) === 2, 'Expected 2 ERP lager MCP tools, got ' . count($tools));
+
+$names = array_map(static fn (array $tool): string => $tool['name'], $tools);
+assert_test($names === ['erp_lager.list_products', 'erp_lager.get_product'], 'Unexpected ERP lager MCP tool names');
+
+$productTool = $tools[1];
+assert_test($productTool['inputSchema']['required'] === ['product_id'], 'Product detail tool must require product_id');
+assert_test($productTool['inputSchema']['properties']['product_id']['type'] === 'integer', 'Product ID must be an integer');
+fwrite(STDOUT, "erp_lager_mcp_tools_list_test: OK\n");