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fix(core): migrate generate-languages-md.js to typescript@7's new compiler API

typescript@7.0.2 removed the classic ts.createProgram/getTypeChecker API that
buildOptionsIndex() relied on to read JSDoc option types, so `npm run
docs:languages` fails outright on main:

  TypeError: Cannot read properties of undefined (reading 'ES2022')

Rewrite it against typescript/unstable/sync (the tsgo-backed replacement) and
typescript/unstable/ast, reusing the project's existing src/tsconfig.json so
compiler options can't drift from what CI's checkJs already enforces.

The regenerated LANGUAGES.md differs only in union member ordering — tsgo
returns union constituents sorted rather than in declaration order, so
`'masculine' | 'feminine'` now renders as `'feminine' | 'masculine'`. Left as
the new API reports it rather than re-sorted here, so the generator stays a
faithful view of the checker.

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