Add scope-collected/scope-clear-collected!/scope-emitted primitives

Register hashtable-based scope accessors that bypass the CEK special form
dispatch, for use by adapter-html.sx and shell templates.

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

hosts/javascript/platform.py

@@ -1141,6 +1141,8 @@ PRIMITIVES_JS_MODULES: dict[str, str] = {
   PRIMITIVES["scope-emit!"] = scopeEmit;
   PRIMITIVES["scope-peek"] = scopePeek;
   PRIMITIVES["scope-emitted"] = sxEmitted;
+  PRIMITIVES["scope-collected"] = sxCollected;
+  PRIMITIVES["scope-clear-collected!"] = sxClearCollected;
 
   // ---- VM stack primitives ----
   // The VM spec (vm.sx) requires these array-like operations.