AerynOS

[Tsu-gu]

https://serpentos.com/

Atomic updates and stateless design ensure your system remains reliable and recoverable, even after interrupted updates.

[Malix-Labs]

Key point: written in Rust

https://aerynos.com/about/

Also its toolchain (package manager, package builder, and boot manager) :

• https://aerynos.com/tooling/

Codebase: https://github.com/AerynOS/

I would consider it

[Malix-Labs]

SerpentOS has been renamed to AerynOS