Cleanup pass to remove refactoring-related artifacts and references

internal/framework/modules/registry.go

@@ -22,8 +22,7 @@ const (
 )
 
 const (
-	ReasonUnsupportedModule   = "unsupported_module"
-	ReasonUnimplementedModule = "unimplemented_module"
+	ReasonUnsupportedModule = "unsupported_module"
 )
 
 var knownModuleKeys = map[string]struct{}{
@@ -66,8 +65,7 @@ type Factory struct {
 	constructors map[string]Constructor
 }
 
-// NewFactory creates a production registry scaffold with known module keys but
-// no real module constructors registered yet.
+// NewFactory creates a production module registry.
 func NewFactory(deps Dependencies) *Factory {
 	factory := &Factory{
 		deps:         deps,
@@ -133,7 +131,7 @@ func (f *Factory) ModuleForSpec(spec contracts.ModuleRunSpec) (contracts.Transcr
 
 	constructor, ok := f.constructors[key]
 	if !ok || constructor == nil {
-		return nil, &UnimplementedModuleError{ModuleKey: key}
+		return nil, fmt.Errorf("internal module registry error: constructor for module %q is not configured", key)
 	}
 
 	module, err := constructor(context.Background(), ConstructRequest{
@@ -170,17 +168,3 @@ func (e *UnsupportedModuleError) Error() string {
 func (e *UnsupportedModuleError) ReasonCode() string {
 	return ReasonUnsupportedModule
 }
-
-// UnimplementedModuleError indicates a known module key without constructor.
-type UnimplementedModuleError struct {
-	ModuleKey string
-}
-
-func (e *UnimplementedModuleError) Error() string {
-	return fmt.Sprintf("module %q is recognized but not implemented", strings.TrimSpace(e.ModuleKey))
-}
-
-// ReasonCode returns a stable reason code suitable for reporting.
-func (e *UnimplementedModuleError) ReasonCode() string {
-	return ReasonUnimplementedModule
-}