zcli

Cut a new zcli release end-to-end. Two phases - first opens a `release/vX.Y.Z` PR adding the `CHANGELOG.md` entry, then (once the user merges that PR) creates the GitHub Release on main which triggers `.github/workflows/release.yml`, watches goreleaser + npm publish + smoke tests, and reports the outcome. Use when the user says "cut a release", "new release", "release", "ship a new version", "tag and release", "release an rc", "promote to stable", "publish v1.0.x", or anything similar - even if they don't name a specific version. **Also re-trigger when the user says the release PR is merged**, "continue the release", "finish the release", "PR is in - ship it", or re-asks about a release they already started; in that case skip to step 4 (Resume after the PR merges).

Prepare a GitHub PR for the current branch using .github/PULL_REQUEST_TEMPLATE.md, with fitting labels. Uses `gh` when available; otherwise outputs the filled PR description and suggested labels for the user to apply manually. Use when the user asks to "create a PR", "open a pull request", "make a PR", etc.