Retranspile + fix browser JIT hook: zero-patch verified

bootstrap.py produces correct output with no post-processing.
Browser sx_browser.ml updated to use Sx_runtime._jit_try_call_fn.
2566/2568 tests pass (2 pre-existing scope).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/ocaml/browser/sx_browser.ml

@@ -836,7 +836,7 @@ let _jit_compiling = ref false
 let _jit_enabled = ref false
 
 let () =
-  Sx_ref.jit_call_hook := Some (fun f args ->
+  Sx_runtime._jit_try_call_fn := Some (fun f args ->
     match f with
     | Lambda l when !_jit_enabled ->
       (match l.l_compiled with