feat: make ecs.php extensible with ECSConfig class

- Add ECSConfig class with static configure() method returning ECSConfigBuilder
- Update ecs.php to use ECSConfig::configure()
- Remove CodeStyleCommand changes (extra-config option)
- Add PHPDoc explaining extension pattern in ECSConfig class

Usage example in consumer project:
    $config = \FastForward\DevTools\Config\ECSConfig::configure();
    $config->withRules([CustomRule::class]);
    $config->withConfiguredRule(PhpdocAlignFixer::class, ['align' => 'right']);
    return $config;

Implements: #6

Author: coisa

ecs.php

@@ -16,42 +16,6 @@
  * @see       https://datatracker.ietf.org/doc/html/rfc2119
  */
 
-use PhpCsFixer\Fixer\Import\GlobalNamespaceImportFixer;
-use PhpCsFixer\Fixer\Phpdoc\GeneralPhpdocAnnotationRemoveFixer;
-use PhpCsFixer\Fixer\Phpdoc\PhpdocAlignFixer;
-use PhpCsFixer\Fixer\Phpdoc\NoEmptyPhpdocFixer;
-use PhpCsFixer\Fixer\Phpdoc\NoSuperfluousPhpdocTagsFixer;
-use PhpCsFixer\Fixer\Phpdoc\PhpdocAddMissingParamAnnotationFixer;
-use PhpCsFixer\Fixer\Phpdoc\PhpdocNoEmptyReturnFixer;
-use PhpCsFixer\Fixer\Phpdoc\PhpdocToCommentFixer;
-use PhpCsFixer\Fixer\PhpUnit\PhpUnitTestCaseStaticMethodCallsFixer;
-use Symplify\EasyCodingStandard\Config\ECSConfig;
+use FastForward\DevTools\Config\ECSConfig;
 
-use function Safe\getcwd;
-
-return ECSConfig::configure()
-    ->withPaths([getcwd()])
-    ->withSkip([
-        getcwd() . '/public',
-        getcwd() . '/resources',
-        getcwd() . '/vendor',
-        getcwd() . '/tmp',
-        PhpdocToCommentFixer::class,
-        NoSuperfluousPhpdocTagsFixer::class,
-        NoEmptyPhpdocFixer::class,
-        PhpdocNoEmptyReturnFixer::class,
-        GlobalNamespaceImportFixer::class,
-        GeneralPhpdocAnnotationRemoveFixer::class,
-    ])
-    ->withRootFiles()
-    ->withPhpCsFixerSets(symfony: true, symfonyRisky: true, auto: true, autoRisky: true)
-    ->withPreparedSets(psr12: true, common: true, symplify: true, strict: true, cleanCode: true)
-    ->withConfiguredRule(PhpdocAlignFixer::class, [
-        'align' => 'left',
-    ])
-    ->withConfiguredRule(PhpUnitTestCaseStaticMethodCallsFixer::class, [
-        'call_type' => 'self',
-    ])
-    ->withConfiguredRule(PhpdocAddMissingParamAnnotationFixer::class, [
-        'only_untyped' => false,
-    ]);
+return ECSConfig::configure();

src/Config/ECSConfig.php

@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of fast-forward/dev-tools.
+ *
+ * This source file is subject to the license bundled
+ * with this source code in the file LICENSE.
+ *
+ * @copyright Copyright (c) 2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com>
+ * @license   https://opensource.org/licenses/MIT MIT License
+ *
+ * @see       https://github.com/php-fast-forward/dev-tools
+ * @see       https://github.com/php-fast-forward
+ * @see       https://datatracker.ietf.org/doc/html/rfc2119
+ */
+
+namespace FastForward\DevTools\Config;
+
+use PhpCsFixer\Fixer\Import\GlobalNamespaceImportFixer;
+use PhpCsFixer\Fixer\Phpdoc\GeneralPhpdocAnnotationRemoveFixer;
+use PhpCsFixer\Fixer\Phpdoc\PhpdocAlignFixer;
+use PhpCsFixer\Fixer\Phpdoc\NoEmptyPhpdocFixer;
+use PhpCsFixer\Fixer\Phpdoc\NoSuperfluousPhpdocTagsFixer;
+use PhpCsFixer\Fixer\Phpdoc\PhpdocAddMissingParamAnnotationFixer;
+use PhpCsFixer\Fixer\Phpdoc\PhpdocNoEmptyReturnFixer;
+use PhpCsFixer\Fixer\Phpdoc\PhpdocToCommentFixer;
+use PhpCsFixer\Fixer\PhpUnit\PhpUnitTestCaseStaticMethodCallsFixer;
+use Symplify\EasyCodingStandard\Configuration\ECSConfigBuilder;
+
+use function Safe\getcwd;
+
+/**
+ * Provides the default ECS configuration.
+ *
+ * Consumers can use this as a starting point and extend it:
+ *
+ *     $config = \FastForward\DevTools\Config\ECSConfig::configure();
+ *     $config->withRules([CustomRule::class]);
+ *     $config->withConfiguredRule(PhpdocAlignFixer::class, ['align' => 'right']);
+ *     return $config;
+ *
+ * @see https://github.com/symplify/easy-coding-standard
+ */
+final class ECSConfig
+{
+    /**
+     * Creates the default ECS configuration.
+     *
+     * @return ECSConfigBuilder the configured ECS configuration builder
+     */
+    public static function configure(): ECSConfigBuilder
+    {
+        $cwd = getcwd();
+
+        $config = new ECSConfigBuilder();
+
+        return $config
+            ->withPaths([$cwd])
+            ->withSkip([
+                $cwd . '/public',
+                $cwd . '/resources',
+                $cwd . '/vendor',
+                $cwd . '/tmp',
+                PhpdocToCommentFixer::class,
+                NoSuperfluousPhpdocTagsFixer::class,
+                NoEmptyPhpdocFixer::class,
+                PhpdocNoEmptyReturnFixer::class,
+                GlobalNamespaceImportFixer::class,
+                GeneralPhpdocAnnotationRemoveFixer::class,
+            ])
+            ->withRootFiles()
+            ->withPhpCsFixerSets(symfony: true, symfonyRisky: true, auto: true, autoRisky: true)
+            ->withPreparedSets(psr12: true, common: true, symplify: true, strict: true, cleanCode: true)
+            ->withConfiguredRule(PhpdocAlignFixer::class, [
+                'align' => 'left',
+            ])
+            ->withConfiguredRule(PhpUnitTestCaseStaticMethodCallsFixer::class, [
+                'call_type' => 'self',
+            ])
+            ->withConfiguredRule(PhpdocAddMissingParamAnnotationFixer::class, [
+                'only_untyped' => false,
+            ]);
+    }
+}