Shorter hook name, disableable via disabled_hooks config, migration added for backward compatibility. Also forces agent switch to Hephaestus on Sisyphus + GPT detection. Docs updated with new hook name.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>