Register Zarrs.jl in Julia General registry

[jhamman]

Summary

Zarrs.jl is not yet registered in the Julia General registry. Users currently need to install from the GitHub URL directly. Registration would enable Pkg.add("Zarrs") to work.

Prerequisites

Before registration:

• Stable Project.toml with correct UUID, version, and compat bounds
• CI passing on Julia stable (1.10+)
• Documentation deployed (already set up via Documenter.jl)
• BinaryBuilder artifacts available or clear build-from-source instructions (Rust toolchain requirement)

Notes

• The Rust toolchain build requirement is unusual for Julia packages — the README should clearly document this prerequisite
• Consider whether BinaryBuilder prebuilt binaries (Test and validate BinaryBuilder recipe for prebuilt binaries #5) should land first to reduce friction for users
• Registration is done via Registrator.jl or the @JuliaRegistrator bot on GitHub

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