Add Rust language support — memory safety + ownership validation

[rudra496]

Summary

Add Rust language support. AI tools frequently generate incorrect Rust code because of its strict ownership/borrowing rules.

Unique Rust patterns to detect

Ownership & Borrowing (AI struggles with these)

• clone() overuse — AI clones everything instead of borrowing
• Unnecessary unsafe blocks
• Raw pointer usage where safe Rust works
• &mut aliasing violations
• Missing lifetime annotations

Security

• unsafe blocks with dangerous operations
• unwrap() / expect() on user input — panics in production
• todo!(), unimplemented!() — incomplete code
• Command injection via std::process::Command
• Hardcoded secrets

Hallucinations

• Non-existent crates (cross-reference crates.io popular crates)
• Invented trait implementations
• Fake std API methods
• Wrong derive macros

Logic

• Dead code from unused variables (Rust compiler catches this, but AI may disable the lint)
• match arms that are unreachable
• Incorrect Result/Option handling patterns

Approach

Pattern-based regex analysis. Rust has very consistent syntax which makes this feasible.

Acceptance Criteria

• .rs files auto-detected and analyzed
• clone() overuse detection
• unsafe block analysis
• unwrap() on user input detection
• Crate hallucination detection
• Tests with real AI-generated Rust samples
• Documentation updated

Difficulty

Advanced — requires understanding of Rust's ownership model to create meaningful checks.