Added MAC Core core policy controls

Property	Value
description	Added the core site-policy settings used by MAC Core for shared project behavior.
version	1.0.0
type	Create
related	Settings

• Added core policy controls for developer branding, comments behavior, native-post admin restrictions, frontend admin bar behavior, and dashboard cleanup.
• Added settings for automatic updates, site health visibility, excerpt length, uninstall cleanup, and the last-login admin column.
• Kept the comments behavior explicitly opt-in through a master control instead of forcing comment policy changes on every site.
• Shipped the core policy layer as shared project behavior that can be reused across multiple Circea WordPress builds.