Type-Safe Environment Variables in Convex

A new feature in Convex version 1.39 and later introduces type-safe environment variables to prevent runtime errors. Developers can declare variables and their expected types within the `convex.config.ts` file using built-in validators. This process generates typed accessors and validates the variables during development and deployment, throwing errors if they are missing or mismatched. The feature also improves the development experience for AI agents by providing explicit context on required configuration, and it extends to components, which can declare their own expected environment variables.