Adds a no-restricted-syntax rule scoped to *.spec.ts / *.test.ts that flags any vi.mock call whose first argument starts with 'pdfjs-dist'. Turns the ~2-min CI wait into an immediate lint error on save. Updates ADR 012 Enforcement section to document the rule. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>