feat: implement dynamic rule discovery and incremental level filtering

src/Rules/RuleLevels.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+class RuleLevels
+{
+    /**
+     * Get rule instances for the specified level.
+     * Levels are incremental: Level 5 includes all rules from Levels 1, 2, 3, and 4.
+     *
+     * @param int $level
+     * @return array<int, \YakNet\AccessibilityConsole\Rules\RuleInterface|\YakNet\AccessibilityConsole\Core\AbstractRule>
+     */
+    public static function getRulesForLevel(int $level): array
+    {
+        $rules = [];
+        $files = glob(__DIR__ . '/*.php');
+        if ($files === false) {
+            return [];
+        }
+
+        foreach ($files as $file) {
+            $className = pathinfo($file, PATHINFO_FILENAME);
+            $fqcn = 'YakNet\AccessibilityConsole\Rules\\' . $className;
+
+            if (class_exists($fqcn)) {
+                $reflection = new \ReflectionClass($fqcn);
+
+                if ($reflection->isAbstract() || $reflection->isInterface() || $reflection->isTrait()) {
+                    continue;
+                }
+
+                // Check if it is a concrete rule
+                $isRule = $reflection->isSubclassOf(\YakNet\AccessibilityConsole\Core\AbstractRule::class) || 
+                          $reflection->implementsInterface(\YakNet\AccessibilityConsole\Rules\RuleInterface::class);
+
+                if ($isRule) {
+                    // Exclude Turkish custom rules to match standard behavior
+                    if (in_array($className, ['EmptyLinkRule', 'HeadingOrderRule', 'ImageAltRule'], true)) {
+                        continue;
+                    }
+
+                    $instance = $reflection->newInstance();
+
+                    // Check level
+                    $ruleLevel = 4; // default
+                    if (method_exists($instance, 'getLevel')) {
+                        /** @var mixed $levelVal */
+                        $levelVal = $instance->getLevel();
+                        if (is_int($levelVal)) {
+                            $ruleLevel = $levelVal;
+                        }
+                    }
+
+                    if ($ruleLevel <= $level) {
+                        /** @var \YakNet\AccessibilityConsole\Rules\RuleInterface|\YakNet\AccessibilityConsole\Core\AbstractRule $instance */
+                        $rules[] = $instance;
+                    }
+                }
+            }
+        }
+
+        // Sort rules by class name to ensure deterministic order
+        usort($rules, function ($a, $b) {
+            return strcmp(get_class($a), get_class($b));
+        });
+
+        return $rules;
+    }
+}