feat(04-01): generate jobs and admin controllers, reject model imports

Scaffold pact.Job and pact.AdminController stubs with Winter YAML
assets, and fail summer build when models imports a sibling package.

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

internal/build/stubs/artifacts.tmpl

@@ -59,3 +59,61 @@ func {{.Func}}() bonfire.Command {
 	}
 }
 {{end}}
+
+{{define "job.go"}}// Code generated by summer make. DO NOT EDIT.
+
+package jobs
+
+import (
+	"context"
+	"fmt"
+
+	"git.golem15.com/golem15/summercms/pact"
+)
+
+// {{.Ident}}Args is the typed payload for {{.Kind}}.
+type {{.Ident}}Args struct{}
+
+func ({{.Ident}}Args) Kind() string { return {{printf "%q" .Kind}} }
+
+type {{.Worker}} struct{}
+
+func ({{.Worker}}) Work(ctx context.Context, args pact.JobArgs) error {
+	if _, ok := args.({{.Ident}}Args); !ok {
+		return fmt.Errorf("jobs: unexpected args type %T", args)
+	}
+	return nil
+}
+
+// {{.Func}} returns the {{.Kind}} job.
+func {{.Func}}() pact.Job { return {{.Worker}}{} }
+{{end}}
+
+{{define "admin_controller.go"}}// Code generated by summer make. DO NOT EDIT.
+
+package controllers
+
+import "git.golem15.com/golem15/summercms/pact"
+
+type {{.Worker}} struct{}
+
+func ({{.Worker}}) ID() string        { return {{printf "%q" .Kind}} }
+func ({{.Worker}}) ModelName() string { return {{printf "%q" .Ident}} }
+func ({{.Worker}}) ConfigDir() string { return {{printf "%q" .ConfigDir}} }
+
+// {{.Func}} returns the {{.Kind}} admin controller.
+func {{.Func}}() pact.AdminController { return {{.Worker}}{} }
+{{end}}
+
+{{define "fields.yaml"}}fields:
+    id:
+        label: ID
+        span: auto
+        type: number
+{{end}}
+
+{{define "columns.yaml"}}columns:
+    id:
+        label: ID
+        searchable: true
+{{end}}