/**
* Suspense-style out-of-order streaming for SSR.
*
* Renders the synchronous shell with `defer(...)` placeholders wrapped in
* `…` markers, flushes that initial chunk,
* then streams a `…` plus a tiny inline
* patch script for every resolved promise. The patch script swaps the
* template content into the placeholder and removes both.
*
* Honours `SSRContext.signal` for cancellation and propagates the context
* nonce onto every emitted `