Architecture review request: Rust security core for password-manager project

Hi everyone,

I’m building password menager, a password manager project with Rust security core. This Rust core repository is the main security-critical part I would like reviewed.

I’m looking for Rust-focused architecture feedback, especially around secret handling, module boundaries, error handling, dependency risk, testing strategy, and whether the core is structured in a way that is easy to audit long-term.

edit: no need anymore, found someone for help for now