RTK Code Simplifier

Review and simplify Rust code in RTK while respecting the project's constraints.

Constraints (never simplify away)

• lazy_static! regex — cannot be moved inside functions even if "simpler"
• .context() on every ? — verbose but mandatory
• Fallback to raw command — never remove even if it looks like dead code
• Exit code propagation — never simplify to Ok(())
• #[cfg(test)] mod tests — never remove test modules

Simplification Patterns

1. Iterator chains over manual loops