Issue 3350 remediation evidence

Findings addressed

• item-pagination.test.tsx now derives complete numbered-token inventories for each generated fixture and asserts every token exactly once. Sampled token-to-physical-page placement checks remain separate.
• Pagination fixtures snapshot metadata.layout.pages before rendering and assert authored layout pages are unchanged afterward. Overflow fixtures also assert physical PDF page count exceeds authored page count.
• Unsafe wrap={false} renderer coverage remains diagnostic-only; no item controls, schema flags, or runtime behavior were added.

Verification

• rtk proxy pnpm --filter @reactive-resume/pdf exec vitest run src/semantic/pagination.test.tsx src/templates/shared/item-pagination.test.tsx — 2 files, 11 tests passed.
• rtk proxy pnpm --filter @reactive-resume/pdf typecheck — passed.
• rtk proxy pnpm exec biome check packages/pdf/src/templates/shared/item-pagination.test.tsx — passed.
• rtk proxy pnpm exec turbo boundaries — passed; 1109 files checked.
• rtk git diff --check origin/main...HEAD — passed.

Only PDF test coverage and this evidence file changed; production behavior remains untouched.