Add type annotations to remaining untyped spec params

trampoline (eval.sx), signal/deref (signals.sx), aser (adapter-sx.sx).

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

shared/sx/ref/eval.sx

@@ -55,7 +55,7 @@
 ;; --------------------------------------------------------------------------
 
 (define trampoline
-  (fn (val)
+  (fn ((val :as any))
     ;; Iteratively resolve thunks until we get an actual value.
     ;; Each target implements thunk? and thunk-expr/thunk-env.
     (let ((result val))