Fix WASM trampoline stub + event-bridge host-get

- sx_browser.ml: use Sx_ref.trampoline instead of Sx_runtime.trampoline
  (the stub was a no-op, causing cek-call to return unresolved Thunks).
  Fixes resource island promise resolution — promises now resolve and
  update signals correctly.

- event-bridge island: use host-get instead of get for event-detail,
  since WASM kernel returns JS host handles for CustomEvent detail
  objects, not native SX dicts.

- Mark event-bridge and isomorphic-nav as test.fixme (deeper issues
  remain: event handler swap! doesn't propagate to DOM; header island
  inside #main-panel swap boundary needs structural layout change).

99 passed, 2 skipped, 0 failed.

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

hosts/ocaml/browser/sx_browser.ml

@@ -257,7 +257,7 @@ let api_eval_vm src_js =
     let compile_fn = match Hashtbl.find_opt _vm_globals "compile-module" with
       | Some v -> v
       | None -> env_get global_env "compile-module" in
-    let code_val = Sx_runtime.trampoline (Sx_runtime.sx_call compile_fn [List exprs]) in
+    let code_val = Sx_ref.trampoline (Sx_runtime.sx_call compile_fn [List exprs]) in
     let code = Sx_vm.code_from_value code_val in
     let result = Sx_vm.execute_module code _vm_globals in
     (* Sync VM globals → CEK env so subsequent eval() calls see defines *)
@@ -457,7 +457,7 @@ let () =
     match args with
     | [f; a] when is_callable f ->
       let arg_list = match a with List l -> l | Nil -> [] | v -> [v] in
-      Sx_runtime.trampoline (Sx_runtime.sx_call f arg_list)
+      Sx_ref.trampoline (Sx_runtime.sx_call f arg_list)
     | [f; _] -> raise (Eval_error ("cek-call: not callable: " ^ type_of f))
     | _ -> raise (Eval_error "cek-call: expected (fn args)"));
 
@@ -675,13 +675,13 @@ let () =
     match args with
     | [f; a; _] | [f; a] when is_callable f ->
       let arg_list = match a with List l -> l | Nil -> [] | v -> [v] in
-      Sx_runtime.trampoline (Sx_runtime.sx_call f arg_list)
+      Sx_ref.trampoline (Sx_runtime.sx_call f arg_list)
     | _ -> raise (Eval_error "call-lambda: expected (fn args env?)"));
   bind "cek-call" (fun args ->
     match args with
     | [f; a] when is_callable f ->
       let arg_list = match a with List l -> l | Nil -> [] | v -> [v] in
-      Sx_runtime.trampoline (Sx_runtime.sx_call f arg_list)
+      Sx_ref.trampoline (Sx_runtime.sx_call f arg_list)
     | [f; _] -> raise (Eval_error ("cek-call: not callable: " ^ type_of f))
     | _ -> raise (Eval_error "cek-call: expected (fn args)"));
   bind "cek-eval" (fun args ->

shared/static/wasm/sx_browser.bc.wasm.js

@@ -1792,7 +1792,7 @@
             blake2_js_for_wasm_create: blake2_js_for_wasm_create};
    }
    (globalThis))
-({"link":[["runtime-0db9b496",0],["prelude-d7e4b000",0],["stdlib-23ce0836",[]],["sx-64e6b16e",[2]],["jsoo_runtime-f96b44a8",[2]],["js_of_ocaml-651f6707",[2,4]],["dune__exe__Sx_browser-490a8e59",[2,3,5]],["std_exit-10fb8830",[2]],["start-80fdb768",0]],"generated":(b=>{var
+({"link":[["runtime-0db9b496",0],["prelude-d7e4b000",0],["stdlib-23ce0836",[]],["sx-64e6b16e",[2]],["jsoo_runtime-f96b44a8",[2]],["js_of_ocaml-651f6707",[2,4]],["dune__exe__Sx_browser-2ac146e9",[2,3,5]],["std_exit-10fb8830",[2]],["start-80fdb768",0]],"generated":(b=>{var
 c=b,a=b?.module?.export||b;return{"env":{"caml_ba_kind_of_typed_array":()=>{throw new
 Error("caml_ba_kind_of_typed_array not implemented")},"caml_exn_with_js_backtrace":()=>{throw new
 Error("caml_exn_with_js_backtrace not implemented")},"caml_int64_create_lo_mi_hi":()=>{throw new

sx/sx/reactive-islands/index.sx

@@ -523,7 +523,7 @@
                     (on-event el "inbox:message"
                       (fn (e)
                         (swap! messages (fn (old)
-                          (append old (get (event-detail e) "text"))))))))))))
+                          (append old (host-get (event-detail e) "text"))))))))))))
     (div :ref container-ref
       (p :class "text-xs font-semibold text-stone-500 mb-2" "Event Bridge Demo")
       (p :class "text-sm text-stone-600 mb-2"

tests/playwright/demo-interactions.spec.js

@@ -233,7 +233,7 @@ test.describe('Reactive island interactions', () => {
   });
 
   test.fixme('event-bridge: sender triggers receiver update', async ({ page }) => {
-    // BUG: on-event listener via schedule-idle + container-ref not receiving CustomEvents from data-sx-emit buttons
+    // BUG: on-event handler receives CustomEvent but swap!/signal update doesn't propagate to DOM
     await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.event-bridge-demo)))', { waitUntil: 'networkidle' });
     await page.waitForTimeout(2000);
 
@@ -269,8 +269,7 @@ test.describe('Reactive island interactions', () => {
     }
   });
 
-  test.fixme('resource: shows loading then data', async ({ page }) => {
-    // BUG: resource promise never resolves in WASM kernel — host-await/promise-then callback not firing
+  test('resource: shows loading then data', async ({ page }) => {
     await page.goto(BASE_URL + '/sx/(geography.(reactive.(examples.resource)))', { waitUntil: 'networkidle' });
     await page.waitForTimeout(2000);
 

tests/playwright/isomorphic.spec.js

@@ -177,7 +177,7 @@ test.describe('Isomorphic SSR', () => {
   });
 
   test.fixme('navigation preserves header island state', async ({ page }) => {
-    // BUG: header island color resets after SPA nav — signals re-initialized instead of preserved
+    // BUG: header island inside #main-panel swap boundary — needs structural layout change or store-based state
     await page.goto(BASE_URL + '/sx/', { waitUntil: 'networkidle' });
 
     // Wait for header island to hydrate