LearnKit v0.9.0-beta.1

Beta release for testing

Fix: Block enqueue parity

LearnKit CSS/JS now loads correctly when using Gutenberg blocks (not just shortcodes).

Feat: Direct checkout magic link

Single-product course enroll button now skips the product page and goes straight to checkout.

⚠️ Pre-release — do not install on production.

Full Changelog: v0.8.8...v0.9.0-beta.1