Procedural macros for Ordo rule engine

This crate provides derive macros for generating TypedContext implementations that enable zero-overhead field access in JIT-compiled code.

Usage

use ordo_derive::TypedContext;

#[derive(TypedContext)]
#[repr(C)]  // Recommended for stable layout
pub struct LoanContext {
    pub amount: f64,
    pub credit_score: i32,
    pub approved: bool,
}

The macro generates an implementation of TypedContext that provides:

• A static MessageSchema describing the struct layout
• Direct field pointer access via field_ptr()
• Nested field path resolution (for nested structs)