ci-maintenance

Run, understand, and debug Murmur's CI — the local scripts/ci.sh gate and the GitHub Actions macOS PR-gate that wraps it. The map of every gate step (receipt/remote enforcement → control-plane audits/selftests → swiftc → clippy → cargo test → cargo audit → cargo deny → cargo build → ng lint → ng build → E2E), how to reproduce a red CI run locally with the exact command CI uses, and every repo-specific gotcha (heavy…