OCaml CEK machine compiled to WebAssembly for browser execution

- wasm_of_ocaml compiles OCaml SX engine to WASM (722/722 spec tests)
- js_of_ocaml fallback also working (722/722 spec tests)
- Thin JS platform layer (sx-platform.js) with ~80 DOM/browser natives
- Lambda callback bridge: SX lambdas callable from JS via handle table
- Side-channel pattern bypasses js_of_ocaml return-value property stripping
- Web adapters (signals, deps, router, adapter-html) load as SX source
- Render mode dispatch: HTML tags + fragments route to OCaml renderer
- Island/component accessors handle both Component and Island types
- Dict-based signal support (signals.sx creates dicts, not native Signal)
- Scope stack implementation (collect!/collected/emit!/emitted/context)
- Bundle script embeds web adapters + WASM loader + platform layer
- SX_USE_WASM env var toggles WASM engine in dev/production
- Bootstrap extended: --web flag transpiles web adapters, :effects stripping

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.dev-sx.yml

@@ -16,6 +16,7 @@ services:
       SX_USE_OCAML: "1"
       SX_OCAML_BIN: "/app/bin/sx_server"
       SX_BOUNDARY_STRICT: "1"
+      SX_USE_WASM: "1"
       SX_DEV: "1"
     volumes:
       - /root/rose-ash/_config/dev-sh-config.yaml:/app/config/app-config.yaml:ro