ci: add zizmor GitHub Actions security lint

[robjtede]

Adds zizmor security analysis to the existing lint workflow. The job uses read-only permissions, disables checkout credential persistence, and emits GitHub annotations without uploading SARIF to Advanced Security.

Summary by CodeRabbit

• Chores
  • Added automated security checks for GitHub Actions workflows.
  • Enabled read-only permissions and inline security annotations for clearer findings.
  • Removed automated dependency update approval and merge handling.

[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: aec51629-9647-4e9e-bc45-9777225b1884

📥 Commits

Reviewing files that changed from the base of the PR and between b2e6cbd and f53cddd.

📒 Files selected for processing (1)

• .github/workflows/dependabot-reviewer.yml

💤 Files with no reviewable changes (1)

• .github/workflows/dependabot-reviewer.yml

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📝 Walkthrough

Walkthrough

The lint workflow adds a zizmor job with restricted permissions and annotations. The Dependabot reviewer workflow is deleted.

Changes

Workflow security linting

Layer / File(s)	Summary
Add zizmor security job .github/workflows/lint.yml	The lint workflow adds a pinned zizmor-action with read-only permissions, disabled persisted checkout credentials, annotations enabled, and advanced security disabled.

Estimated code review effort: 2 (Simple) | ~10 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 the primary change: adding zizmor GitHub Actions security linting.
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 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-zizmor-lint

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