Add CVE-2026-26960 (tar) and CVE-2026-26996 (minimatch) to .trivyignore.
These are embedded in next/dist/compiled/ and cannot be fixed via pnpm
overrides — requires upstream Next.js release with updated bundles.
Also add .trivyignore to all pipeline path filters so future changes
to the ignore file trigger CI validation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>