ci-actions

Review, design, troubleshoot, and optimize GitHub Actions workflows: fast feedback, caching, test matrices, reusable jobs, reproducible artifacts, and secure delivery. Includes advice-only workflow reviews when the caller asks for findings without edits. Triggers: 'set up CI', 'speed up this pipeline', 'why is this workflow failing', 'harden the pipeline'. Not for application failures after deployment (pcf-ops, gcp-ops), runtime bugs (root-cause), or a live outage, including one a deploy caused (incident-investigation).