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System service manager — registers and manages XPC service endpoints

Registers and exposes an XPC service endpoint for inter-process communication with other system components. Communicates with multiple network endpoints and manages bundle identifiers for service discovery and routing. Uses three entitlements to enforce access control and sandbox boundaries. Handles 13 core functions related to service initialization, message handling, and lifecycle management. Operates as an Apple-signed system daemon without user-facing interface.AI