outdatedなコメントのactorが表示されない

<img width="2124" height="954" alt="Image" src="https://github.com/user-attachments/assets/61fd8756-9ba6-4624-b98f-bc668ce68d4e" />

## asis
`[outdated] <file_path>`

## expected
`[outdated] @<actor_id(e.g. @copilot)> <file_path>`