challenge 0.1.0

A lightweight CLI for ALTCHA Proof-of-Work v2 challenges.
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# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project follows semantic versioning.

## [0.1.0] - 2026-06-13

### Added

- Initial `challenge` CLI package.
- Commands for creating, solving, and verifying ALTCHA Proof-of-Work v2 challenges.
- `verify-payload` command for `/register` request bodies containing `altcha.challenge` and `altcha.solution`.
- `verify-server` command for ALTCHA Sentinel server-signature payloads.
- Example JSON fixtures.
- Integration tests and GitHub Actions CI/publish workflows.