fix(compute): tuple3/tuple4 pin typing

[digitalwannabe]

Description

Tuple3/Tuple4 Split had Tuple2 as input type
Tuple4 Join had Tuple3 as output type

Change Type

• New shader node
• New SDSL function
• Shader modification
• Core engine change (C#)
• Help/documentation
• [x ] Bug fix
• Performance improvement
• Refactoring

Affected Domains

• Noise
• SDF (Signed Distance Fields)
• [x ] Compute
• Domain (Raymarching)
• Color
• Transform
• Texture
• Geometry
• Fluid
• Other:

Breaking Changes

• None
• API changes (C# method signatures)
• Shader signature changes (SDSL)
• [x ] VL node changes (pins added/removed/renamed)
• Behavior changes (same inputs, different outputs)

Migration Guide

Since these nodes don't work as expected at all without the fix I'm assuming they have not been used until now.

Testing

• Tested with existing help patches
• New help patch added
• Existing help patch updated
• [x ] Manual GPU output verification
• Performance tested

Test Details

I am actively using the nodes in a compute system i am building, its working as expected...

Related Issues

Screenshots/Videos

Checklist

• [x ] I have read CONTRIBUTING.md
• [x ] I have followed the patterns in PATTERNS.md
• [x ] My code follows the existing style
• I have added documentation for new features
• All existing help patches still work