feat(04-01): generate model, migration, and command artifacts

Add make:model, make:migration and make:command with plugin-id
inference, duplicate rejection, and a deterministic registry refresh
that leaves handwritten plugin.go untouched.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/build/stubs/artifacts.tmpl

@@ -0,0 +1,61 @@
+{{define "model.go"}}// Code generated by summer make. DO NOT EDIT.
+
+package models
+
+import "time"
+
+// {{.Ident}} is a generated GORM model for {{.PluginID}}.
+type {{.Ident}} struct {
+	ID        uint `gorm:"primaryKey"`
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+func ({{.Ident}}) TableName() string { return {{printf "%q" .Table}} }
+{{end}}
+
+{{define "migration.go"}}// Code generated by summer make. DO NOT EDIT.
+
+package updates
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// {{.Func}} returns the {{.MigrationID}} gormigrate entry.
+func {{.Func}}() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: {{printf "%q" .MigrationID}},
+		Migrate: func(tx *gorm.DB) error {
+			return tx.Exec({{printf "%q" .UpSQL}}).Error
+		},
+		Rollback: func(tx *gorm.DB) error {
+			return tx.Exec({{printf "%q" .DownSQL}}).Error
+		},
+	}
+}
+{{end}}
+
+{{define "command.go"}}// Code generated by summer make. DO NOT EDIT.
+
+package console
+
+import (
+	"context"
+
+	"git.golem15.com/golem15/summercms/bonfire"
+)
+
+// {{.Func}} returns the {{.CommandName}} console command.
+func {{.Func}}() bonfire.Command {
+	return bonfire.Command{
+		Name:        {{printf "%q" .CommandName}},
+		Description: {{printf "%q" .Description}},
+		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
+			out.Printf({{printf "%q" .CommandName}} + "\n")
+			return nil
+		},
+	}
+}
+{{end}}