HS: possessive expression via its (+1 test)

Two generator changes: (a) `parse_run_locals` for Pattern 2
(`var R = await run(...)`) now recognises `result: <literal>` in the
opts dict and binds it to `it` so `run("its foo", {result: {foo: "foo"}})`
produces `(eval-hs-locals "its foo" (list (list (quote it) {:foo "foo"})))`.
Also adds the same extraction to Pattern 1 (`expect(run(...)).toBe(...)`).
(b) `_hs-wrap-body` emitted by the generator no longer shadows `it` to
nil — it only binds `event` — so eval-hs-locals's outer `it` binding is
visible inside the wrapped body. `eval-hs` still binds `it` nil at its
own `fn` wrapper so nothing regresses.

Suite hs-upstream-expressions/possessiveExpression: 22/23 → 23/23.
Smoke 0-195: 162/195 unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

spec/tests/test-hyperscript-behavioral.sx

@@ -27,8 +27,10 @@
 ;; bare expressions (e.g. `foo.foo`) get the expression value back.
 (define _hs-wrap-body
   (fn (sx)
+    ;; Wrap body to capture return via `it`. `event` default is always nil.
+    ;; `it` is NOT shadowed here — callers (eval-hs-locals) may pre-bind it.
     (list (quote let)
-      (list (list (quote it) nil) (list (quote event) nil))
+      (list (list (quote event) nil))
       (list (quote let)
         (list (list (quote _ret) sx))
         (list (quote if) (list (quote nil?) (quote _ret)) (quote it) (quote _ret))))))
@@ -5679,7 +5681,7 @@
       (dom-append (dom-body) _el-pDiv)
     ))
   (deftest "can access its properties"
-    (assert= (eval-hs "its foo") "foo")
+    (assert= (eval-hs-locals "its foo" (list (list (quote it) {:foo "foo"}))) "foo")
   )
   (deftest "can access multiple basic attributes"
     (hs-cleanup!)