Harden GitHub workflows

[samdark]

Summary

• Pin reusable yiisoft/actions workflows to a commit SHA.
• Replace unsafe pull_request_target workflow triggers with pull_request where present.
• Set read-only GITHUB_TOKEN permissions for read-only workflows.

Validation

• zizmor --no-progress --no-exit-codes classifier/.github/workflows

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-zizmor-workflows

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