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/PatternInsightInterface.php

@@ -1,11 +1,11 @@
 <?php
 
-namespace Aternos\Codex\Analysis;
+namespace IndifferentKetchup\Codex\Analysis;
 
 /**
  * Interface PatternInsightInterface
  *
- * @package Aternos\Codex\Analysis
+ * @package IndifferentKetchup\Codex\Analysis
  */
 interface PatternInsightInterface extends InsightInterface
 {