HS: hyperscript:beforeFetch event + runner dict format (+1 test)

- hs-fetch gains target param; dispatches hyperscript:beforeFetch before fetch
- compiler emits (quote me) as target arg
- runner io-fetch returns unified dict {_type:'dict', ok, status, _body, ...}
  so runtime (get raw :key) calls work correctly (22/23 fetch tests pass)

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

lib/hyperscript/compiler.sx

@@ -1832,7 +1832,7 @@
                   (list (quote fn) (list) (hs-to-sx (nth ast 1)))
                   (list (quote fn) (list) (hs-to-sx (nth ast 2)))))
               ((= head (quote fetch))
-                (list (quote hs-fetch) (hs-to-sx (nth ast 1)) (nth ast 2) (nth ast 3)))
+                (list (quote hs-fetch) (hs-to-sx (nth ast 1)) (nth ast 2) (nth ast 3) (quote me)))
               ((= head (quote fetch-gql))
                 (list
                   (quote hs-fetch-gql)