The broker boundary, connection modes, error taxonomy, source layout, and the fixed graph interaction contract.
The Dataplane API v3 endpoints HAProxy UI calls, authentication, environment variables, and the PUT-replaces hazard.
How the build proves HAProxy UI models the entire Dataplane v3 schema — and why an unmodelled field is a data-loss risk, not a missing feature.
Every package.json command, the local Dataplane stack, and the verification sequence a change must pass before shipping.
The next platform target: iPad via Tauri 2, and the input, layout and Rust constraints that already govern how features get built.