Step 17: streaming render — hyperscript enhancements, WASM builds, live server tests

Streaming chunked transfer with shell-first suspense and resolve scripts.
Hyperscript parser/compiler/runtime expanded for conformance. WASM static
assets added to OCaml host. Playwright streaming and page-level test suites.

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

shared/static/wasm/sx/compiler.sx

@@ -728,7 +728,7 @@
                   (and
                     (not (empty? rest-args))
                     (= (type-of (first rest-args)) "keyword"))
-                  (let
+                  (letrec
                     ((skip-annotations (fn (items) (if (empty? items) nil (if (= (type-of (first items)) "keyword") (skip-annotations (rest (rest items))) (first items))))))
                     (skip-annotations rest-args))
                   (first rest-args)))))