M0: engine command registry, file formats, view math and CPU renderer

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/render/src/lib.rs

@@ -1 +1,11 @@
+//! View math shared by the GPU viewport and headless rendering: an orbit camera with
+//! perspective or orthographic projection, screen ↔ world mapping and picking rays, plus a small
+//! CPU rasterizer (z-buffer, shaded triangles, depth-tested lines) for snapshots without a GPU.
+#![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
+#![forbid(unsafe_code)]
 
+mod camera;
+mod raster;
+
+pub use camera::{Camera, Mat4, StandardView};
+pub use raster::{Canvas, Rgb, Scene, SceneLine, SceneMesh, render, render_png};