[Feature Request] Improve preload for archives

# List of page types which aren't included in preload:

* Post type archive page
* Author archive page
* Woocommerce product category/tag
* Sub-pages of all archives

I'll think over about more details. For now, I'm just opening _Feature Request_.

No files, tests, or entry points are named. Start by tracing the existing archive preload behavior in the repository, then determine how post type, author, WooCommerce product taxonomy, and archive sub-pages should be discovered and preloaded. Done means the requested archive page types are included without breaking current preload behavior.

Written by the indexing model from the issue text.