Merge worktree-endpoints: migrate all ref endpoints to SX with typed handlers

shared/sx/ref/platform_py.py

@@ -226,10 +226,11 @@ def make_handler_def(name, params, body, env, opts=None):
     path = opts.get('path') if opts else None
     method = str(opts.get('method', 'get')) if opts else 'get'
     csrf = opts.get('csrf', True) if opts else True
+    returns = str(opts.get('returns', 'element')) if opts else 'element'
     if isinstance(csrf, str):
         csrf = csrf.lower() not in ('false', 'nil', 'no')
     return HandlerDef(name=name, params=list(params), body=body, closure=dict(env),
-                      path=path, method=method.lower(), csrf=csrf)
+                      path=path, method=method.lower(), csrf=csrf, returns=returns)
 
 
 def make_query_def(name, params, doc, body, env):