Added MAC Core reusable helper library

Property	Value
description	Added the documented public helper layer for templates, builders, and light shared site code.
version	1.0.0
type	Create
related	Utils, Helpers

• Added the reusable helper layer for shared template and builder behavior that belongs in MAC Core instead of individual child themes.
• Shipped helpers for array counting, post type labels, taxonomy labels, post terms output, plugin status checks, and theme status checks.
• Kept helper loading explicit through the Helpers settings module so wrappers are only available when the corresponding toggles are enabled.
• Documented the shipped wrappers as the stable public helper API from 1.0.0 onward.