#9955 feat(gitlab): add permission CSV exporter

Summary

• Add a standalone GitLab exporter for both Search permission CSVs, with paced requests and atomic output.
• Document the export and revision-checked CI upload. Stop on missing primary emails or incomplete exports.

Type of Change

• New feature

Testing

• HTTPS fixture exercises the CLI in a subprocess, then validates its CSVs with Sim's existing parser and grant resolver: 16 checks.
• Negative controls verify duplicate identities, hidden emails, redirects, expired memberships, and inconsistent pagination totals are rejected; issues-only projects export successfully and request pacing is enforced.
• Root tests, lint, type-check, audits, and block registry check.
• Production docs build, compatibility checks, and responsive layout verification.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)