HS: block literals callable as zero-arg lambdas (+4 tests)

Fix compiler: (block-literal () body) was emitting bare body instead of
(fn () body). Now always wraps in fn regardless of param count.
Generator: MANUAL_TEST_BODIES for all 4 blockLiteral tests using apply
and SX map rather than JS array.map.

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

lib/hyperscript/compiler.sx

@@ -1078,10 +1078,7 @@
                   (let
                     ((params (map make-symbol (nth ast 1)))
                       (body (hs-to-sx (nth ast 2))))
-                    (if
-                      (= (len params) 0)
-                      body
-                      (list (quote fn) params body))))
+                    (list (quote fn) params body)))
                 ((= head (quote me)) (quote me))
                 ((= head (quote beingTold)) (quote beingTold))
                 ((= head (quote it)) (quote it))