Rename agent parameter to subagent_type for consistency with delegate-task tool changes. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
- Rename directories: sisyphus-task → delegate-task - Rename types: SisyphusTaskArgs → DelegateTaskArgs, etc. - Rename functions: createSisyphusTask → createDelegateTask - Rename constants: SISYPHUS_TASK_* → DELEGATE_TASK_* - Update tool name: sisyphus_task → delegate_task - Update all prompts, docs, and tests