feat(scanner): add GitLab CI SAST integration

[cybercraftsolutionsllc]

Summary

Adds GitLab CI/SAST integration for ISNAD Scanner.

What Changed

• Adds gitlab-sast CLI command that scans a glob and writes a GitLab SAST report JSON artifact.
• Adds scanner/src/gitlab.ts to convert scanner findings into GitLab Security Dashboard-compatible vulnerability records.
• Adds root .gitlab-ci.yml template with configurable ISNAD_SCAN_TARGETS.
• Adds docs/GITLAB_CI.md with setup instructions and an example pipeline.
• Adds report conversion tests.

Validation

cd scanner
npm test

Result: 2 tests passing.

cd scanner
npm run scan -- gitlab-sast "src/**/*.ts" --output gitlab-test-report.json

Result: report written successfully; scanned 8 files and emitted a GitLab SAST JSON report.

Closes #5.

[vercel]

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