add golden test stuff

golden-tests/tests/hello/expected

@@ -0,0 +1,12 @@
+0.IO : 1.★ → ★
+ω.print : 1.String → IO {ok}
+ω.main : IO {ok}
+IO = □
+print = scheme:(lambda (str) (builtin-io (display str) (newline)))
+#[main] main = print "hello 🐉"
+;; IO erased
+(define print
+   (lambda (str) (builtin-io (display str) (newline))))
+(define main
+   (print "hello \x1f409;"))
+hello 🐉

golden-tests/tests/hello/hello.quox

@@ -0,0 +1,7 @@
+def0 IO : ★ → ★ = λ A ⇒ IOState → A × IOState
+
+#[compile-scheme "(lambda (str) (builtin-io (display str) (newline)))"]
+postulate print : String → IO {ok}
+
+#[main]
+def main = print "hello 🐉"

golden-tests/tests/hello/run

@@ -0,0 +1,2 @@
+. ../lib.sh
+compile_run "$1" hello.quox hello.ss