feat: inline every rsc and remove is_root

[davesnx]

• Fix Root Element and Suspense Handling #347 and inlines the RSC payload
• Fix HTML Encoding and Security #346
• Fix Debug Information Improvements #345

[Copilot]

Pull request overview

This PR changes the RSC/HTML streaming format to inline payloads (removing root special-casing), improves debug/context handling across async boundaries, and adds streaming controls (timeout + progressive chunk sizing).

Changes:

• Inline RSC payloads into chunk 0 where possible and update model serialization shape (incl. debug/owner metadata).
• Add render_html streaming controls: ~timeout and ~progressive_chunk_size; add stack-frame filtering hooks for model rendering.
• Extend tests/benchmarks to cover the new inlining, context propagation across async Suspense, debug payloads, and streaming behavior.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
packages/server-reason-react-ppx/server_reason_react_ppx.ml	Fix option prop JSON encoding to serialize Some via inner [%to_json].
packages/server-reason-react-ppx/cram/server-client-props.t/input.re	Adds a PPX regression case for option(...) annotated props.
packages/server-reason-react-ppx/cram/server-client-props.t/run.t	Updates expected expanded output for option prop serialization.
packages/reactDom/src/ReactServerDOM.mli	Extends public API with timeout/chunk sizing and stack filtering hooks.
packages/reactDom/src/ReactServerDOM.ml	Implements inlined model output, debug info, context across async, and buffered streaming + timeout.
packages/reactDom/src/dune	Adds lwt.unix dependency for timeout support.
packages/reactDom/src/ReactDOM.mli	Exposes attribute_to_html in the public interface.
packages/reactDom/src/ReactDOM.ml	Updates Provider pattern matches for new Provider record fields.
packages/react/src/React.mli	Extends Provider and Context.t to support async context propagation.
packages/react/src/React.ml	Implements async context propagation via Lwt.with_value/Lwt.get in useContext.
packages/reactDom/test/test_RSC_model.ml	Updates expected RSC chunks and adds extensive coverage for new behaviors.
packages/reactDom/test/test_RSC_html_shell.ml	Updates shell streaming expectations and forces small progressive chunks in tests.
packages/reactDom/test/test_RSC_html.ml	Adds timeout tests, chunk-size tests, and new escaping/context/Suspense expectations.
packages/html/Html.ml	Escapes & in single-quote attribute escaping for safer HTML attributes.
demo/universal/native/DB.re	Refactors editNote to update/write notes with explicit Result handling.
demo/server/pages/SinglePageRSC.re	Switches to layout-based HTML wrapper and updates content markup.
demo/server/pages/ServerOnlyRSC.re	Switches to layout callback API.
demo/server/DreamRSC.re	Changes env debug comparison operator.
demo/client/SinglePageRSC.re	Switches client boot to createFromFetch + createRoot render.
benchmark/dune	Adds Lwt deps and lwt_ppx for async benchmarks.
benchmark/bench.ml	Adds async RSC benchmarks via render_html and Lwt_main.run.

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