Add pre-commit GitHub Action

[adamtheturtle]

Summary\n- add a pre-commit GitHub Action workflow to run hooks on PRs and on a schedule\n\n## Testing\n- not run (action only)

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Note

Low Risk
CI-only change that adds a linting workflow; minimal impact beyond potentially failing builds if hooks surface new issues.

Overview
Adds a new GitHub Actions Lint workflow that runs pre-commit hooks via pre-commit/action@v3.0.1.

The workflow triggers on pull_request and push to main, plus a daily cron run, and uses checkout with persist-credentials: false and empty permissions for least-privilege.

^{Written by Cursor Bugbot for commit 369d196. This will update automatically on new commits. Configure here.}