feat(browser): add function form page.evaluate

[jackwener]

Summary

• add page.evaluate(fn, ...args) overload for daemon-backed and direct-CDP pages
• serialize function args through JSON.stringify and reject string eval with stray args
• keep existing string eval / wrapForEval behavior for current adapters
• migrate twitter/following href + API fetch snippets to function form and update adapter-author docs

Verification

• npm test -- --run src/browser/utils.test.ts src/browser/page.test.ts src/browser/base-page.test.ts src/browser/article-extract.test.ts clis/twitter/following.test.js
• npm run typecheck
• npm run build
• npm run docs:build
• npm run check:typed-error-lint
• npm run check:silent-column-drop
• git diff --check