BREP 0.2.0

BREP — umbrella crate for the BREP CAD kernel family: re-exports the geometry kernel (always) plus the gizmos, wgpu render engine, and eframe application behind feature flags.
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# BREP

Umbrella crate for the **BREP** CAD kernel family. One dependency that
re-exports the geometry kernel and, behind feature flags, the higher layers of
the stack — so downstream code says `use brep::kernel::…` / `use brep::render::…`
instead of depending on each sibling crate directly.

| `brep::` module | Feature    | Backing crate  | Role |
|-----------------|------------|----------------|------|
| `kernel`        | *(always)* | [`BREP_kernel`](../BREP_kernel) | The BREP geometry kernel (NURBS B-rep, booleans, tessellation). |
| `gizmos`        | `gizmos`   | [`BREP_gizmos`](../BREP_gizmos) | In-scene gizmos / overlay widgets (pure geometry + hit-testing). |
| `render`        | `render`   | [`BREP_render`](../BREP_render) | Windowing-agnostic wgpu render/pick engine. |
| `app`           | `app`      | [`BREP_app`](../BREP_app)       | The eframe (egui + wgpu) CAD application. |

The kernel is always re-exported; everything above it is opt-in so a headless
geometry consumer never compiles `wgpu` / `eframe`.

```toml
[dependencies]
BREP = "0.2"                                      # kernel only (headless)
BREP = { version = "0.2", features = ["render"] } # + the wgpu render engine
BREP = { version = "0.2", features = ["full"] }   # everything, incl. the app
```

Additional features: `full` (= `app`), and `parallel` (forwards to the kernel's
rayon-parallel tessellation).

> **Package vs. lib name:** the crates.io package is `BREP`; the Rust library is
> `brep` (lowercase, lint-clean). This mirrors the whole family — package
> `BREP_render` / lib `brep_render`, etc. See [PUBLISHING.md](../PUBLISHING.md).