Rename namespace Aternos\Codex to IndifferentKetchup\Codex

Bulk substitution across all PHP files in src/ and test/. Covers
namespace declarations, use statements, fully-qualified class
references, and @package PHPDoc tags. No logic changes.

src/Analysis/AutomatableSolutionInterface.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Aternos\Codex\Analysis;
+namespace IndifferentKetchup\Codex\Analysis;
 
 /**
  * Interface AutomatableSolutionInterface
@@ -9,7 +9,7 @@ namespace Aternos\Codex\Analysis;
  * that a solution can be solved automatically
  * e.g. deletion/creation/modification of files
  *
- * @package Aternos\Codex\Analysis
+ * @package IndifferentKetchup\Codex\Analysis
  */
 interface AutomatableSolutionInterface extends SolutionInterface
 {