fix: prevent self-referencing composer dependency in enterprise package

ensureComposerEnterprise() now skips repos whose composer.json name
matches 'mokoconsulting-tech/enterprise' to avoid the package requiring
itself. Also removes the re-added self-reference from composer.json.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/Enterprise/RepositorySynchronizer.php

@@ -769,6 +769,11 @@ HCL;
             return;
         }
 
+        // Don't add self-referencing dependency — skip if this IS the enterprise package
+        if (($json['name'] ?? '') === 'mokoconsulting-tech/enterprise') {
+            return;
+        }
+
         $expectedConstraint = 'dev-' . self::VERSION_BRANCH;
 
         // Check if enterprise package is already required with correct constraint