Email notification for push shows repository owner instead of commit author

[sumire-fujimiya]

Description

When a collaborator pushes commits to a pull request branch, the email notification shows the repository owner's username instead of the actual commit author.

Steps to Reproduce

1. Repository owner: @xxx
2. Collaborator: @sumire-fujimiya (with push access)
3. @sumire-fujimiya pushes a commit to a PR branch
4. The commit's author and committer are both set to sumire with the email sumire@inbaa.dev, which is the verified primary email on the @sumire-fujimiya account
5. The email notification says: @xxx pushed 1 commit.

Expected Behavior

The notification should show @sumire-fujimiya pushed 1 commit. since both the git author/committer email and the GitHub account are correctly linked.

Actual Behavior

The notification shows @xxx pushed 1 commit. — the repository owner's name, not the person who actually pushed.

Additional Context

• The git config user.email matches the verified primary email on the collaborator's GitHub account
• The commit is correctly attributed to @sumire-fujimiya in the GitHub web UI
• Only the email notification text is incorrect

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