chore: configure git allowed_signers in agent setup

[skevetter]

Configures the SSH allowed_signers file in mise.agent.toml so the system's git log --show-signature works correctly to verify SSH signed commits made by the agent environment.

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PR created automatically by Jules for task 13498311009275841678 started by @skevetter

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[github-actions]

⚠️ This PR contains unsigned commits. To get your PR merged, please sign those commits (git rebase --exec 'git commit -S --amend --no-edit -n' @{upstream}) and force push them to this branch (git push --force-with-lease).

If you're new to commit signing, there are different ways to set it up:

Sign commits with gpg

Follow the steps below to set up commit signing with gpg:

1. Generate a GPG key
2. Add the GPG key to your GitHub account
3. Configure git to use your GPG key for commit signing

Sign commits with ssh-agent

Follow the steps below to set up commit signing with ssh-agent:

1. Generate an SSH key and add it to ssh-agent
2. Add the SSH key to your GitHub account
3. Configure git to use your SSH key for commit signing

Sign commits with 1Password

You can also sign commits using 1Password, which lets you sign commits with biometrics without the signing key leaving the local 1Password process.

Learn how to use 1Password to sign your commits.