feat(classifier): has_short_latin_name() helper for drop-logic

includes/class-classifier.php

@@ -243,4 +243,23 @@ final class Classifier
         }
         return false;
     }
+
+    /**
+     * Checks whether the form's name field contains 1-3 ASCII alphanumeric characters
+     * (typical bot pattern: "OB", "MU", "A1B"). Used by drop hard-rule.
+     *
+     * Looks first at canonical CF7 keys (your-name, name, имя, fio), then falls back to
+     * the value-based heuristic in FieldDetector::find_name(). Returns false if no name
+     * field is present (i.e. forms without a name field are immune to this rule).
+     *
+     * @param array<string,string|string[]> $fields CF7 posted_data
+     */
+    public static function has_short_latin_name(array $fields): bool
+    {
+        $name = self::pick_field($fields, ['your-name', 'name', 'имя', 'fio']);
+        if ($name === '') $name = FieldDetector::find_name($fields);
+        $name = trim($name);
+        if ($name === '') return false;
+        return (bool)preg_match('/^[A-Za-z0-9]{1,3}$/', $name);
+    }
 }

tests/ClassifierDropTest.php

@@ -43,4 +43,42 @@ final class ClassifierDropTest extends Cf7stgTestCase
         $fields = ['msg' => 'try alice@in or bob@example.com'];
         self::assertTrue(Classifier::has_valid_email_anywhere($fields));
     }
+
+    public function test_has_short_latin_name_true_for_two_letters(): void
+    {
+        $fields = ['your-name' => 'OB'];
+        self::assertTrue(Classifier::has_short_latin_name($fields));
+    }
+
+    public function test_has_short_latin_name_true_for_three_alnum(): void
+    {
+        $fields = ['name' => 'A1B'];
+        self::assertTrue(Classifier::has_short_latin_name($fields));
+    }
+
+    public function test_has_short_latin_name_false_for_long_name(): void
+    {
+        $fields = ['your-name' => 'Melissa'];
+        self::assertFalse(Classifier::has_short_latin_name($fields));
+    }
+
+    public function test_has_short_latin_name_false_for_cyrillic(): void
+    {
+        $fields = ['your-name' => 'Иван'];
+        self::assertFalse(Classifier::has_short_latin_name($fields));
+    }
+
+    public function test_has_short_latin_name_false_when_no_name_field(): void
+    {
+        // Только телефон, нет name-полей. FieldDetector::find_name пропустит +79991234567 (digits)
+        $fields = ['tel-1' => '+79991234567'];
+        self::assertFalse(Classifier::has_short_latin_name($fields));
+    }
+
+    public function test_has_short_latin_name_picks_via_field_detector(): void
+    {
+        // text-211 не в списке известных name-ключей, FieldDetector найдёт 'XY' (no digits, len=2)
+        $fields = ['text-211' => 'XY', 'text-212' => '+79991234567'];
+        self::assertTrue(Classifier::has_short_latin_name($fields));
+    }
 }