First attempt at a GPU runner

Currently failing with an error I don't understand:

```
wgpu error: Validation Error

Caused by:
  In Device::create_shader_module, label = '...\image_binary.spv'

Shader '...\image_binary.spv' parsing error: InvalidTypeWidth(1)
```

Cargo.toml

@@ -1,7 +1,8 @@
 [workspace]
 members = [
     "enkou-shaders",
-    "enkou-shaders-tests",
+    "examples/image-runner",
+    "examples/image-binary",
 ]
 resolver = "3"
 
@@ -13,6 +14,7 @@ license = "MIT"
 repository = ""
 
 [workspace.lints.rust]
+missing_docs = { level = "warn" }
 unexpected_cfgs = { level = "allow", check-cfg = ['cfg(target_arch, values("spirv"))'] }
 
 [workspace.dependencies]
@@ -21,6 +23,7 @@ spirv-std = { git = "https://github.com/Rust-GPU/rust-gpu.git", rev = "67f1ff2"
 
 anyhow = "1.0.102"
 bytemuck = { version = "1.25.0", features = ["derive"] }
+futures = "0.3.32"
 glam = { version = "0.33.1", default-features = false, features = ["bytemuck", "scalar-math"] }
 image = { version = "0.25.10", default-features = false, features = ["default-formats"]}
 libm = "0.2.16"
@@ -28,3 +31,6 @@ rand = { version = "0.10.1", default-features = false }
 rand_xoshiro = "0.8.1"
 rspirv = "0.13.0"
 tempfile = "3.27.0"
+thiserror = "2.0.19"
+wgpu = { version = "30.0.0", features = ["spirv"] }
+xflags = "0.3.2"