Warning system for hx.

Provides macros for emitting user-facing warnings with consistent formatting and optional de-duplication.

Usage

use hx_warnings::{warn_user, warn_user_once};

// Enable warnings (typically done once at startup)
hx_warnings::enable();

// Emit a warning
warn_user!("This is a warning about {}", "something");

// Emit a warning only once (de-duplicated by message content)
warn_user_once!("This warning will only appear once");