hegel-core

Changelog style guide for writing RELEASE.md files. Use when creating or reviewing RELEASE.md, writing changelog entries, or preparing a PR that needs release notes.

This skill should be used when creating or modifying conformance tests in hegel-core, when adding a new ConformanceTest subclass, when writing a conformance binary for tests/conformance/tests/, or when instrumenting the hegel server to report metrics for conformance validation. Also use when debugging conformance test failures or understanding how library implementations (hegel-go, hegel-rust) are validated.