Generate imaging and rendering API shims

crates/libremetaverse-imaging-skia/src/lib.rs

@@ -1,5 +1,12 @@
 //! Skia imaging adapter corresponding to `LibreMetaverse.Imaging.Skia`.
 
+extern crate self as libremetaverse_imaging_skia;
+
+pub mod backend {
+    /// Project-owned bitmap boundary; no `SkiaSharp` API is copied.
+    pub struct SKBitmap;
+}
+
 mod generated;
 
 pub use generated::*;