Standardize unimplemented API failures

crates/libremetaverse-imaging-skia/Cargo.toml

@@ -9,6 +9,7 @@ description = "Skia codec shims for the MetaCrate LibreMetaverse rewrite"
 
 [dependencies]
 libremetaverse-imaging = { path = "../libremetaverse-imaging" }
+libremetaverse-types = { path = "../libremetaverse-types" }
 
 [lints]
 workspace = true

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

@@ -3,7 +3,7 @@
 #![allow(non_camel_case_types)]
 
 /// `class` shim for C# `LibreMetaverse.Imaging.Skia.SkiaTextureCodec`; members remain intentionally unimplemented.
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct SkiaTextureCodec;
 impl SkiaTextureCodec {
     pub const CSHARP_NAME: &'static str = "LibreMetaverse.Imaging.Skia.SkiaTextureCodec";

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

@@ -4,3 +4,4 @@ mod generated;
 
 pub use generated::*;
 pub use libremetaverse_imaging as imaging;
+pub use libremetaverse_types::NotImplemented as Error;