gh-pr-release-flow

Handle GitHub repos that may block direct pushes to main and require pull-request-first delivery plus post-merge release work. Use when changing a GitHub repo and you need to: (1) detect whether direct pushes are blocked, (2) switch to branch + PR flow, (3) decide whether release work must wait until after merge, (4) create PRs, tags, and releases in the correct order, or (5) avoid repeating the 'push rejected, PR required' mistake.