Replace archetypes with kinds

Agent-Logs-Url: https://github.com/jeduden/mdsmith/sessions/456d9e30-3668-49b8-9a42-1b286b593ef5

Co-authored-by: jeduden <1117699+jeduden@users.noreply.github.com>

Author: Claude

internal/rules/requiredstructure/rule_test.go

@@ -9,7 +9,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/jeduden/mdsmith/internal/archetypes"
 	"github.com/jeduden/mdsmith/internal/lint"
 	"github.com/jeduden/mdsmith/internal/rule"