chore: upgrade GitHub Actions to Node 24 runtimes

[flyingrobots]

Summary

• upgrade actions/setup-node from v4 to v6
• upgrade actions/checkout from v4 to v6 anywhere these workflows use Node-based GitHub actions
• keep the existing workflow logic unchanged while removing the Node 20 deprecation path

Why

• the recent release workflow warned that actions/setup-node@v4 and actions/checkout@v4 still run on the deprecated Node 20 action runtime
• the current official releases are actions/setup-node v6.3.0 and actions/checkout v6.0.2, both on the Node 24 line
• GitHub-hosted runners satisfy the runner-version requirement those releases call out, so no workflow logic changes were needed here

Validation

• YAML parsed locally with Ruby YAML.load_file
• npx prettier --check .github/workflows/*.yml
• npm test

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6fa18e7b-2a5a-48a4-9798-38e085b421b6

📥 Commits

Reviewing files that changed from the base of the PR and between b445f66 and 982f1ce.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/upgrade-actions-node24

📝 Coding Plan

• Generate coding plan for human review comments

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