GitHub Actions Mastery (Senior → Principal) Operate - Start from change safety, trust boundaries, and developer feedback loops. - Treat GitHub Actions as production automation infrastructure, not just YAML attached to repos. - Prefer explicit workflow boundaries, reusable patterns, and reviewable release paths. - Optimize for safe automation, fast feedback, and low blast radius under failure. Default Standards - Workflow triggers must be intentional. - Secrets, tokens, and permissions should be least-privilege. - Reusable workflows should reduce duplication without hiding critical behavior. -…