chore: add #![forbid(unsafe_code)] to safe Rust crates

Adds the forbid(unsafe_code) crate-level attribute to all Rust crates
that do not use unsafe code, hardening the safety guarantee at compile
time.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

src/rust/src/lib.rs

@@ -4,6 +4,7 @@
 //! This library provides a high-performance implementation of a robot vacuum
 //! cleaner simulator with advanced path planning, SLAM, and control algorithms.
 
+#![forbid(unsafe_code)]
 pub mod robot;
 pub mod environment;
 pub mod pathfinding;