Merge ocaml-vm: reactive runtime demos, sx-web plan, build fixes

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

hosts/javascript/bootstrap.py

@@ -130,7 +130,7 @@ def compile_ref_to_js(
         ("render.sx", "render (core)"),
         ("web-forms.sx", "web-forms (defstyle, deftype, defeffect, defrelation)"),
     ]
-    for name in ("parser", "html", "sx", "dom", "engine", "orchestration", "boot"):
+    for name in ("parser", "html", "sx", "dom-lib", "browser-lib", "dom", "engine", "orchestration", "boot"):
         if name in adapter_set:
             sx_files.append(ADAPTER_FILES[name])
     # Use explicit ordering for spec modules (respects dependencies)