Restore hyperscript work on stable site base (908f4f80)

Reset to last known-good state (908f4f80) where links, stepper, and
islands all work, then recovered all hyperscript implementation,
conformance tests, behavioral tests, Playwright specs, site sandbox,
IO-aware server loading, and upstream test suite from f271c88a.

Excludes runtime changes (VM resolve hook, VmSuspended browser handler,
sx_ref.ml guard recovery) that need careful re-integration.

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

hosts/ocaml/browser/bundle.sh

@@ -71,6 +71,11 @@ cp "$ROOT/shared/sx/templates/tw-layout.sx" "$DIST/sx/"
 cp "$ROOT/shared/sx/templates/tw-type.sx"   "$DIST/sx/"
 cp "$ROOT/shared/sx/templates/tw.sx"        "$DIST/sx/"
 
+# 10. Hyperscript
+for f in tokenizer parser compiler runtime integration; do
+  cp "$ROOT/lib/hyperscript/$f.sx" "$DIST/sx/hs-$f.sx"
+done
+
 # Summary
 WASM_SIZE=$(du -sh "$DIST/sx_browser.bc.wasm.assets" | cut -f1)
 JS_SIZE=$(du -sh "$DIST/sx_browser.bc.js" | cut -f1)