debug_kit Cache panel DebugEngine does not override add(), resulting in broken add operations to caches

[micheleprimavera-fattura]

When the Cache panel is enabled, the engine is replaced with a DebugEngine, which has an empty configuration. Calling add on this engine generates a warning on a missing prefix key and overall does nothing.

2026-08-13 14:22:44 warning: Undefined array key "prefix" in /Users/michele/fatturaelettronicapa/vendor/cakephp/cakephp/src/Cache/CacheEngine.php on line 373
Trace:
Cake\Error\ErrorTrap->handleError() /Users/michele/fatturaelettronicapa/vendor/cakephp/cakephp/src/Cache/CacheEngine.php, line 373
Cake\Cache\CacheEngine->_key() /Users/michele/fatturaelettronicapa/vendor/cakephp/cakephp/src/Cache/CacheEngine.php, line 304
Cake\Cache\CacheEngine->add() /Users/michele/fatturaelettronicapa/vendor/cakephp/cakephp/src/Cache/Cache.php, line 605
Cake\Cache\Cache::add() /Users/michele/fatturaelettronicapa/vendor/cakephp/queue/src/QueueManager.php, line 296
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