audit-ct-tidy: close milestone ct-tidy via ctt.tidy

docs/DESIGN.md

@@ -1732,13 +1732,18 @@ wording is fixed; the categories and their triggers are:
 
 **Class-schema diagnostics** (validation of class declarations):
 
-- `KindMismatch` — class param appears in applied position in any
-  method signature (e.g., `f a` where `f` is the class param).
 - `InvalidSuperclassParam` — superclass `type` differs from the
   class's own `param`.
 - `ConstraintReferencesUnboundTypeVar` — a constraint mentions a
   type variable not bound by the surrounding `forall`.
 
+A class param appearing in applied position (e.g., `f a` where `f`
+is the class param) is rejected earlier by the canonical-form
+validator as `BareCrossModuleTypeRef` — `f` is a bare,
+non-primitive name not declared as a `TypeDef` in the owning
+module — so the dedicated `KindMismatch` diagnostic was retired
+at iter ctt.3.
+
 **Typecheck diagnostics** (per function body):
 
 - `MissingConstraint` — body's residual constraint is not covered
@@ -1758,9 +1763,12 @@ axis-5 (kind `*` only) covers the space.
 
 - **Multi-parameter classes** (`class Foo a b where ...`). Schema
   rejects: `ClassDef.param` is a string, not a list.
-- **Higher-kinded class params** (`class Functor f`). Diagnostic
-  S1 (`KindMismatch`) at class declaration if any method applies
-  the param.
+- **Higher-kinded class params** (`class Functor f`). Rejected at
+  workspace-load time: `BareCrossModuleTypeRef` from canonical-form
+  validation fires before class-schema validation if any method
+  body uses the param as a `Type::Con` head — bare non-primitive
+  names must be declared as a `TypeDef` in the owning module, and
+  a class param is not.
 - **Higher-rank polymorphism** (`forall a. (forall b. b -> b) -> a`).
   Already rejected at parse time per the typeclass-conversation
   rationale recorded in JOURNAL; constraint-bearing