# P5A ZIP Export Design

The compiler owns a pure `exportNativeRoadPackage(result, destination)` function. It writes a
temporary root-flat directory from the already compiled Web/CLI state, validates it with the same
manifest/source validator used by compiler output, then writes a deterministic ZIP. The Web download
handler and CLI are thin callers of this function.

ZIP layout:

```text
manifest.json
compiled.json
diagnostics.json
comparison.json
traffic-signal-assemblies.json
traffic-signals.json
layers/<12 declared sources>.geojson
```

`manifest.generator` is informational only. The host accepts solely the `contract`, `areaId`, and
declared files. ZIP creation normalizes entry order and timestamps so the export is hash-stable.
Failure never replaces a chosen output file.