Optional Selenium/Playwright extractor for JS-heavy pages

[pokymono]

Why

The architecture mentions an extractor for JS-heavy pages, but it hasn't been implemented. Many modern websites require JavaScript execution to properly extract content.

Tasks

• Introduce an optional dependency path (e.g., extras: web-render).
• Implement an extractor that uses Selenium or Playwright to handle JS-heavy pages with a hard timeout.
• Document the heavy footprint and recommend skipping in CI environments.

Acceptance Criteria

• There is a config key (e.g., selenium) that resolves when the extra dependency is installed and fails cleanly when it is not.

[samarthnaikk]

I'd like to work on this

[pokymono]

okay, I've assigned you