ci: disable checkout credential persistence

[robjtede]

Disable checkout credential persistence in the CI and lint workflow checkout steps.

Validation: git diff --check.

Summary by CodeRabbit

• Chores
  • Updated automated workflows to improve credential handling during repository checkout.
  • Applied the same security configuration consistently across continuous integration and code-quality checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8c700e61-c669-4602-8a35-abfc40ffe236

📥 Commits

Reviewing files that changed from the base of the PR and between ac031fa and fb3ace1.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/lint.yml

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📝 Walkthrough

Walkthrough

The CI and lint workflows configure GitHub Actions checkout steps with persist-credentials: false. The setting applies to the main CI, clippy, rustfmt, and docs jobs.

Changes

CI credential configuration

Layer / File(s)	Summary
Disable persisted checkout credentials .github/workflows/ci.yml, .github/workflows/lint.yml	The CI, clippy, rustfmt, and docs checkout steps disable persisted GitHub credentials.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes disabling checkout credential persistence in the CI workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/checkout-persist-credentials

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