### Problem/Motivation The AI module's `AudioToAudio` operation type has no corresponding ECA execute action in this module. ECA flows cannot drive `AudioToAudio` without a custom action plugin. Existing per-operation actions: Chat, Embedding, Moderation, Speech to Text, Text to Speech (`src/Plugin/Action/`). ### Proposed resolution Add `Plugin\Action\AudioToAudio` extending `AiConfigActionBase`, mirroring `Chat.php`: - Plugin id: `ai_integration_eca_execute_audio_to_audio` - Builds the matching Input class from `Drupal\ai\OperationType\AudioToAudio\` and dispatches it through the configured provider. - Add a `Kernel\Plugin\Action\AudioToAudioTest` mirroring the existing per-action tests. ### API changes None. --- _Filed with AI assistance (Claude Code)._