diff --git a/crates/ailang-core/src/workspace.rs b/crates/ailang-core/src/workspace.rs
index fb98c24..061295d 100644
--- a/crates/ailang-core/src/workspace.rs
+++ b/crates/ailang-core/src/workspace.rs
@@ -452,6 +452,12 @@ pub fn load_workspace(entry_path: &Path) -> Result<Workspace, WorkspaceLoadError
     let prelude = load_prelude();
     modules.insert("prelude".to_string(), prelude);
 
+    // ct.1: enforce the canonical-form rule on Type::Con and
+    // Term::Ctor.type_name. Runs before class-schema validation
+    // so a stale bare cross-module ref fires the canonical-form
+    // diagnostic instead of a downstream one.
+    validate_canonical_type_names(&modules)?;
+
     // Iter 22b.2: class-schema validation runs before registry
     // construction so that ill-kinded class definitions are rejected
     // before any instance against them is registered.
@@ -1796,25 +1802,30 @@ mod tests {
         }
     }
 
-    /// Iter 22b.2: a class whose parameter `f` appears in applied
-    /// position (`Type::Con { name == "f", args.len() > 0 }`) inside
-    /// a method signature must fire `KindMismatch`. Decision 11 axis
-    /// 5 forbids HKTs — class params are kind `*` only, never
-    /// constructors.
+    /// ct.1: a class whose parameter `f` appears as a `Type::Con`
+    /// name (the malformed-but-historically-test-fixture shape used
+    /// to trigger `KindMismatch` pre-ct.1) is now caught earlier by
+    /// the canonical-type-names validator: `f` is bare,
+    /// non-primitive, and not a TypeDef in the owning module, so
+    /// `BareCrossModuleTypeRef` fires before `validate_classdefs`
+    /// gets a chance to run. The `KindMismatch` path stays in the
+    /// codebase as dead-but-defensive code; a future tidy may
+    /// retire it.
     #[test]
-    fn class_param_in_applied_position_fires_kind_mismatch() {
+    fn class_param_in_applied_position_fires_canonical_form_rejection() {
         let entry = std::path::PathBuf::from(
             "../../examples/test_22b2_kind_mismatch.ail.json",
         );
         let err = load_workspace(&entry)
-            .expect_err("must fire kind-mismatch");
+            .expect_err("must fire canonical-form rejection");
         match err {
-            WorkspaceLoadError::KindMismatch { class, param, method, .. } => {
-                assert_eq!(class, "Functor");
-                assert_eq!(param, "f");
-                assert_eq!(method, "fmap");
+            WorkspaceLoadError::BareCrossModuleTypeRef { module, name, .. } => {
+                assert_eq!(module, "test_22b2_kind_mismatch");
+                assert_eq!(name, "f");
             }
-            other => panic!("expected KindMismatch, got {other:?}"),
+            other => panic!(
+                "expected BareCrossModuleTypeRef (validator now fires first), got {other:?}",
+            ),
         }
     }