WebCrypto-based Iron Implementation

iron-webcrypto is a JavaScript/TypeScript library providing a WebCrypto API-based implementation of `@hapi/iron`. It enables sealing (encrypting and signing) and unsealing JSON-like data using symmetric key encryption with built-in message integrity verification, producing compact, URL-safe string tokens. The current stable version is 2.0.0, which notably dropped support for Node.js versions older than 20 and transitioned to an ESM-only module. It differentiates itself by relying solely on standard WebCrypto APIs, making it highly portable across modern JavaScript runtimes like Node.js v20+, Deno, Bun, and Cloudflare Workers, without depending on Node.js-specific `node:crypto` or `node:buffer` modules. The library's API is designed to be compatible with `@hapi/iron`, facilitating migrations or consistent usage patterns across projects. It ships with full TypeScript type definitions and is primarily intended for server-side or worker environments due to security implications of client-side secret exposure, which could expose encryption secrets.