merge: architecture → hs-f (R7RS steps 4-6, IO suspension, JIT, language libs)

Brings in 306 commits from architecture:
- R7RS: call/cc, raise/guard, records, parameters, syntax-rules, define-library/import
- IO suspension: perform/resume, third CEK phase
- JIT expansion: component/island JIT, OP_SWAP, exception handler stack, scope forms
- OCaml: HTML renderer, Python bridge, epoch protocol, sx_scope.ml
- Language libs: common-lisp, erlang, forth, apl, prolog, tcl, smalltalk, ruby

Conflict resolution: hs-f version kept for all hyperscript .sx files (superseding
architecture's smaller additions). Architecture's platform.py kept with hs-f's
domListen _driveAsync fix applied.

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

shared/static/wasm/sx/hs-runtime.sx

@@ -2855,6 +2855,35 @@
           ((nth entry 2) val)))
       _hs-dom-watchers)))
 
+(define
+  hs-null-error!
+  (fn (selector) (raise (str "'" selector "' is null"))))
+
+(define
+  hs-named-target
+  (fn (selector value) (if (nil? value) (hs-null-error! selector) value)))
+
+(define
+  hs-named-target-list
+  (fn
+    (selector values)
+    (if (nil? values) (hs-null-error! selector) values)))
+
+(define
+  hs-query-named-all
+  (fn
+    (selector)
+    (let
+      ((results (hs-query-all selector)))
+      (if
+        (and
+          (or (nil? results) (and (list? results) (= (len results) 0)))
+          (string? selector)
+          (> (len selector) 0)
+          (= (substring selector 0 1) "#"))
+        (hs-null-error! selector)
+        results))))
+
 (define
   hs-dom-is-ancestor?
   (fn