Changelog Formatter & Generator

## Overview This crystal reads your `git log`, classifies every commit according to the Conventional Commits specification, and assembles a polished CHANGELOG.md that follows the Keep a Changelog format — complete with version groupings, GitHub Issue and PR deep-links, and highlighted breaking changes. ## Features - Recognizes `feat`, `fix`, `docs`, `refactor`, `perf`, `test`, `chore`, and `ci` commit types - Groups entries under the correct semver version heading - Automatically hyperlinks Issue and PR numbers to their GitHub URLs - Flags `BREAKING CHANGE` entries with a prominent section header