TryCompileVertexShader gained an optional scalarRegisterBufferIndex
parameter (#156), and reflection Invoke does not apply C# default
parameter values, so ShaderDump crashed with
TargetParameterCountException. Pad trailing optional parameters with
Type.Missing under BindingFlags.OptionalParamBinding so the declared
defaults are used; only a new required parameter now needs a tool
update, and that fails with a named error instead of a crash.
Verified: all five programs behave as expected (exit 0), all eight
emitted blobs pass spirv-val --target-env vulkan1.3.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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