docs: sync wiki from canonical documentation
wiki: validation fixes (14) + ml-lab notebook references
wiki: add 'Keeping the wiki in sync' note to Contributing
wiki: final-review fixes — Home/Enums accuracy + roll-up corrections
wiki: finalize Home landing page + full-wiki audit
wiki: Reference tail + Project — examples, comparison, contributing, FAQ, status, releases
wiki: fix A8 — run.id hash formula, builder atomic-pair caveat, CONTRIBUTING refs
wiki: Reference pt2 — enums, builders, factories, API surface, back-compat
wiki: fix A7 — n_layers description + params table field order
wiki: Reference pt1 — capabilities, params (core/trainer/transformer)