Move generated metadata tokens behind a hidden compatibility export and tighten the public contract test so the beginner prelude stays focused on generated authoring, Html, forms, navigation, and IntoEffect.
req: dx/006
req: public_api/005
Generate a SHA-256 content hash for the embedded hemx runtime, expose the hashed path from hemx-axum, serve immutable runtime headers, and update examples to load the hemx-owned path instead of fixed /hemx.js URLs.
req: axum_integration/005