WIP: SX request handler — shell statics not passing through

The handler routes correctly and renders content, but shell statics
(__shell-sx-css etc.) resolve to nil/empty in the handler scope.
use-wasm flag also not working — need to remove sx-browser.js fallback.

Needs: debug shell static resolution in SX handler scope.
       Remove sx-browser.js from shell template entirely.

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

web/request-handler.sx

@@ -73,7 +73,7 @@
                       (make-symbol "~shared:shell/sx-page-shell")
                       :title "SX"
                       :csrf ""
-                      :page-sx ""
+                      :page-sx (serialize full-ast)
                       :body-html body-html
                       :component-defs __shell-component-defs
                       :component-hash __shell-component-hash
@@ -89,7 +89,7 @@
                       :inline-css __shell-inline-css
                       :inline-head-js __shell-inline-head-js
                       :init-sx __shell-init-sx
-                      :use-wasm false
+                      :use-wasm true
                       :meta-html "")
                     env))))
             (fn (err) (str "<h1>Render error</h1><pre>" err "</pre>"))))))))