The sameAs → Wikidata entity loop

This PR adds the OrchestKit Wikidata entity to the homepage sameAs, closing the loop that lets AI engines disambiguate the brand from the unrelated musician "YonYon".

What the entity now asserts

instance of      : free and open-source software · plug-in
official website : https://orchestkit.yonyon.ai
source code      : github.com/yonatangross/orchestkit
license          : MIT · programmed in: TypeScript · OS: cross-platform

The one-line change

// docs/site/lib/constants.ts
export const SAME_AS = [
  SITE.github,
  PERSON.url,
+ "https://www.wikidata.org/wiki/Q140128295", // Wikidata entity
] as const;

Before: sameAs pointed only at GitHub — no entity to anchor to. After: a real Wikidata item with P856 back to the site forms a closed, machine-verifiable identity loop. Disambiguation note: the artist "YonYon" has no Wikidata item, so the structural software statements above carry the disambiguation instead of a different from link.