Project- and tracker-agnostic engineering pipeline. Given a normalized work-item plus one or more targets ({repo, base, local checkout, site}), it implements the change with plan-with-docs + TDD in an isolated worktree, runs the REPO'S OWN declared verification (whatever its AGENTS.md / CLAUDE.md / cloud.md prescribes), then mandatory pipeline gates — an agent-browser visual regression for UI changes and `/simplify` + `/code-review` for code changes — then hands to the independent `triage-verifier` agent before opening a DRAFT pull request. For bug-kind items it propagates a verified fix to other sites that actually reproduce it. Returns PR URLs; performs no tracker calls. Usable standalone to resolve a branch against an AC checklist.