docs: refresh 2.5.22 references and CSS evidence

[krflol]

Reference links and the introductory-example CI pin lagged behind the published engine. Import nine reference pages from the final 2.5.22 tag and verify the introductory Python examples against its public wheel. Preserve the font guide's language examples and earlier synthesis evidence in the importer so future syncs retain them.

Add the retained 2.5.22 source-corpus follow-up to the CSS comparison: 1,619 PASS, 25 FAIL, and 18 REFERENCE-DISPUTED. Include unchanged before/after drop-cap renders, the reproduced public-wheel PDF, source provenance, and executable evidence links. Keep the original 2.5.14 published-wheel report and clearly distinguish the newer source-candidate corpus from focused public-package checks. Existing language downloads retain their own tested pins.

Validation:

• Public 2.5.22 wheel: five introductory snippets and eleven commands pass; all six unique page previews visually reviewed.
• Reference import repeated with identical output; strict MkDocs build and the 83-page link/metadata check pass.
• Real Chrome at 1440px, 390px, and 320px: no page overflow, comparison images decode and stack correctly, all nine source links match the tag, and font-guide links survive the import.
• All three new image/PDF assets match the retained public release SHA-256 values; screenshots visually reviewed.

No general CSS-parity or standards-conformance claim. The existing upstream corpus gate still fails, and the remaining failures and disputed references are retained.