test(metatype): lock type_info round-trip example (currently bails)

type_info($T) is still unimplemented, so the round-trip
define(declare("ShapeCopy"), type_info(Shape)) bails with
"type_info is not yet implemented" plus the downstream
enum-inference cascade. Snapshot pins that current behavior;
the next commit implements type_info and turns this green.

examples/expected/0619-comptime-metatype-type-info.exit

@@ -0,0 +1 @@
+1

examples/expected/0619-comptime-metatype-type-info.stderr

@@ -0,0 +1,17 @@
+error: type_info is not yet implemented
+  --> examples/0619-comptime-metatype-type-info.sx:19:43
+   |
+19 | ShapeCopy :: define(declare("ShapeCopy"), type_info(Shape));
+   |                                           ^^^^^^^^^
+
+error: cannot infer enum type for '.circle' — use an explicit type or assign to a typed variable
+  --> examples/0619-comptime-metatype-type-info.sx:30:14
+   |
+30 |     describe(.circle(2.5));
+   |              ^^^^^^^
+
+error: cannot infer enum type for '.rect' — use an explicit type or assign to a typed variable
+  --> examples/0619-comptime-metatype-type-info.sx:31:14
+   |
+31 |     describe(.rect(7));
+   |              ^^^^^

examples/expected/0619-comptime-metatype-type-info.stdout

@@ -0,0 +1 @@
+