//! Core infrastructure for package manager operations.
//!
//! This module provides the foundational utilities that all package managers
//! rely on, including:
//!
//! - **Install detection**: Determines how package managers were installed
//! - **Path discovery**: Utilities for finding package managers in non-standard
//! locations
//! - **Types**: Core data structures (`PmInfo`, `Category`) used throughout
//! - **Update commands**: Generates appropriate update commands based on
//! installation context
//! - **Upstream checking**: Unified interface to query upstream registries for
//! latest versions
//! - **Version handling**: Consistent version extraction and normalization with
//! `??` as the unknown marker
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