Voice rules shared by the prose written for other developers -- code comments in any codebase, commit messages in any repository, and cover letters with their changelogs. The cel-prose:code-comments, cel-prose:commit-message, cel-prose:cover-letter, and cel-prose:version-changelog skills own the per-artifact specifics (line widths, structure, worked examples) and defer here for the voice common to all four. These rules do not apply to LLM-facing text such as skill documentation; a commit message describing a change to that documentation is ordinary prose and does follow them.
