HS: computed property names in object literals (+1 test)

Parser: bracket-open in obj-collect key cond → (computed-key expr).
Compiler: detect computed-key list at object-literal pair key and compile
the inner expression instead of emitting a literal string.
Generator: special case for 'expressions work in object literal field names'
using eval-hs-locals with host-callback so hs-win-call can find the fn.

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

lib/hyperscript/compiler.sx

@@ -933,7 +933,14 @@
                                 (pair)
                                 (list
                                   (quote list)
-                                  (first pair)
+                                  (if
+                                    (and
+                                      (list? (first pair))
+                                      (=
+                                        (first (first pair))
+                                        (quote computed-key)))
+                                    (hs-to-sx (nth (first pair) 1))
+                                    (first pair))
                                   (hs-to-sx (nth pair 1))))
                               pairs)))))))
                 ((= head (quote template))