End-to-end latency optimization

This section records the performance model, implementation changes, and dated evidence across Server, network, daemon, and macOS boundaries.

Reading order

1. Latency model and diagnosis
2. Server hot path
3. macOS first-ready
4. Cross-region gzip experiment
5. Evidence ledger
6. Client loading and request audit — September 17 loading states, request scheduling, and remaining work.

The signing appendix separates local identity failures from latency regressions. Measurements are snapshots tied to a revision, environment, request shape, and completion definition—not permanent SLOs.