refactor: change mkdir permissions from 0777 to 0755 for better security

Author: shimomo

src/ProgramSaver.php

@@ -29,7 +29,7 @@ public function save(array $programs, string $path): void
         }
 
         $dir = dirname($path);
-        if (!is_dir($dir) && !mkdir($dir, 0777, true) && !is_dir($dir)) {
+        if (!is_dir($dir) && !mkdir($dir, 0755, true) && !is_dir($dir)) {
             throw new \RuntimeException("Failed to create directory: {$dir}");
         }
 

tests/ProgramSaverTest.php

@@ -28,7 +28,7 @@ protected function setUp(): void
     {
         parent::setUp();
         $this->tempDir = sys_get_temp_dir() . '/program_saver_test_' . uniqid();
-        mkdir($this->tempDir, 0777, true);
+        mkdir($this->tempDir, 0755, true);
     }
 
     /**