docs: site WIP, extractor type cleanup, tests preset; add broadcastedRef

Type the docs extractor's package.json parsing as unknown; comment the Vite
plugin version-skew cast; wire the tests preset; site/architecture WIP.

docs/eslint.config.ts

@@ -1,4 +1,4 @@
-import { base, compose, imports, stylistic, typescript, vue } from '@robonen/eslint';
+import { base, compose, imports, stylistic, tests, typescript, vue } from '@robonen/eslint';
 
 export default compose(base, typescript, vue, imports, stylistic, {
   name: 'docs/build-scripts',
@@ -7,4 +7,4 @@ export default compose(base, typescript, vue, imports, stylistic, {
     /* Build-time tooling (doc extractor) logs progress to the console. */
     'no-console': 'off',
   },
-});
+}, tests);