Fix resolveSuspense: iterate parsed exprs instead of passing array

parse() returns a list of expressions. resolveSuspense was passing the
entire array to renderToDom, which interpreted [(<> ...)] as a call
expression ((<> ...)) — causing "Not callable: {}". Now iterates
each expression individually, matching the public render() API.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sx/ref/boot.sx

@@ -109,11 +109,14 @@
     (let ((el (dom-query (str "[data-suspense=\"" id "\"]"))))
       (if el
         (do
-          (let ((ast (parse sx))
-                (env (get-render-env nil))
-                (node (render-to-dom ast env nil)))
+          ;; parse returns a list of expressions — render each individually
+          ;; (mirroring the public render() API).
+          (let ((exprs (parse sx))
+                (env (get-render-env nil)))
             (dom-set-text-content el "")
-            (dom-append el node)
+            (for-each (fn (expr)
+              (dom-append el (render-to-dom expr env nil)))
+              exprs)
             (process-elements el)
             (sx-hydrate-elements el)
             (dom-dispatch el "sx:resolved" {:id id})))