New package: Macchiato v0.1.0

[JuliaRegistrator]

• Registering package: Macchiato
• Repository: https://github.com/JuliaMeshless/Macchiato.jl
• Created by: @kylebeggs
• Version: v0.1.0
• Commit: cde97b48c6c6d1dc06b45e6fc4ddd75561916fc2
• Reviewed by: @kylebeggs
• Reference: JuliaMeshless/Macchiato.jl@cde97b4#commitcomment-178519278
• Release notes:

## Initial release of Macchiato.jl

A meshless PDE solver built on radial basis functions.

### Features
- Oceananigans-style Simulation API for defining and running PDE problems
- Linear elasticity model with Dirichlet and traction boundary conditions
- Heat/energy equation support with steady-state and transient solvers
- Shadow point boundary condition enforcement
- Trait-based physics system for extensible PDE definitions
- Sparse row zeroing utility for efficient boundary condition application
- 3D geometry support via STL/mesh import

### Performance
- Shared KNN adjacency lists to reduce redundant computation
- In-place operations and pre-allocated outputs
- Multi-threaded assembly via OhMyThreads

### Documentation
- Getting started guide, examples, and custom PDEs page

### Dependencies
- Built on RadialBasisFunctions.jl, WhatsThePoint.jl, Meshes.jl, and LinearSolve.jl

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