Separate eval from render: render-active? gate in eval-list

eval-list only dispatches to the render adapter when render-active? is true.
render-to-html and aser set render-active! on entry. Pure evaluate() calls
no longer stringify component results through the render adapter.

Fixes component children parity: (defcomp ~wrap (&key &rest children) children)
now returns [1,2,3] in eval mode, renders to "123" only in render mode.

Parity: 112/116 pass (remaining 4 are hand-written evaluator.py bugs).

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

shared/sx/ref/eval.sx

@@ -174,8 +174,8 @@
                 (let ((mac (env-get env name)))
                   (make-thunk (expand-macro mac args env) env))
 
-              ;; Render expression — delegate to active adapter.
-              (is-render-expr? expr)
+              ;; Render expression — delegate to active adapter (only when rendering).
+              (and (render-active?) (is-render-expr? expr))
                 (render-expr expr env)
 
               ;; Fall through to function call