iter ct.4.4: compare_primitives_smoke E2E fixture (closes iter 23.3 Task 4)

crates/ail/tests/e2e.rs

@@ -908,6 +908,25 @@ fn ordering_match_via_prelude_prints_1() {
     assert_eq!(stdout, "1\n");
 }
 
+/// Iter 23.3 Task 4 (resumed in ct.4): the end-to-end
+/// demonstration that the iter-23.1 cross-module Type::Con
+/// mismatch bug is closed. `examples/compare_primitives_smoke.ail.json`
+/// imports prelude, calls `compare` on three pairs each of
+/// Int / Bool / Str (arranged LT / EQ / GT per type), and
+/// pattern-matches the result. Expected stdout encodes the
+/// 9-case decision lattice as `1\n2\n3` × 3.
+///
+/// Pre-canonical-type-names, the bare `Ordering` returned by
+/// `compare` mismatched the qualified `prelude.Ordering`
+/// scrutinee at the user-side pattern lookup. Post-milestone,
+/// the scrutinee is qualified throughout, the pattern lookup
+/// is type-driven, and the run completes cleanly.
+#[test]
+fn compare_primitives_smoke_prints_1_2_3_thrice() {
+    let stdout = build_and_run("compare_primitives_smoke.ail.json");
+    assert_eq!(stdout, "1\n2\n3\n1\n2\n3\n1\n2\n3\n");
+}
+
 /// Iter 23.2: end-to-end coverage for the auto-loaded `Eq` class
 /// + three primitive instances. The fixture calls `eq` on Int /
 /// Bool / Str with both an equal and an unequal pair each; the