Refactor

Improving code without changing what it does. Seven phases, two gates.

The risk here is unlike the other pipelines. Elsewhere the danger is building the wrong thing; here it is changing behaviour while believing you did not. The pull request says "no functional changes", so nobody looks for them — and a behaviour change introduced under that banner is found in production, by a user, weeks later.

Everything below exists to make that impossible to do silently.

Language

Answer in the language the request was written in. Findings, explanations, questions, reports and section headings you produce for a developer follow their language — Russian request, Russian answer.