The installer is meant to be run by CI/CD with no human writes on prod, so
updates should mirror the repo exactly rather than refuse on local drift:
- Replace `git pull --ff-only` with fetch + `checkout -B origin/$BRANCH` +
`reset --hard` + `clean -fd` so the box always matches origin/$BRANCH.
- Set GIT_TERMINAL_PROMPT=0 so a missing/expired credential fails fast in CI
instead of hanging on a prompt.
- npm ci --omit=dev (lockfile, production-only) with a plain-install fallback.
- Allow REPO_URL / REPO_DIR / BRANCH to be overridden from the environment.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
wmantlyandClaude Opus 4.8
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