Inject external assets

The page owns external module assets; direct vectors need no asset wrapper.

An optional earlier section can activate a later module through the same loader.

Share parallel CSS/Shadow acquisition, silently retrying once after a delay. Publish readiness only after both assets and the install hook complete.

Already-loaded code is renderable even while its managed data is pending.

Module boundaries own activation and preserve completed SSR until hydration. Direct component references keep their ordinary native root.

Return a promise for an initialized module. Concurrent callers share one load. Hooks run per caller; module initialization runs once, including bundled modules.

Navigation waits for JavaScript and CSS. Initialization/data run independently; managed component bindings own their loading and error views.

Canonical public component views keep their actual owner and function identity.