Shared config editing operations parameterized by backend

Reflection-based discovery of discriminated union config cases. Replaces manual allCases arrays with automatic DU case enumeration.

.env file operations: reading, comparing, masking, editing.

Reading config vars from environment variables.

Generic config store backed by a parameter store. Maps config var names to parameter paths and provides CRUD operations.

Reusable configuration types and utilities. This module contains generic types for building type-safe configuration systems.

Generic verification infrastructure for config values.