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MudEngine Part 3: File-Based World Loading

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Update the World model

Replace the hardcoded World::new() with a World::from_file(path) method that deserializes the TOML file.

We define serde-compatible structs for the TOML format — TomlRoom includes a numeric id field, and each exit's destination is a room id. The loader copies the data straight through; no name-to-index resolution is needed.

mud-engine-repl/src/main.rs
use std::io::{self, Write};
use serde::Deserialize;

#[derive(Deserialize)]
struct TomlRoom {
    id: usize,
    name: String,
    description: String,
    exits: Vec<TomlExit>,
}

#[derive(Deserialize)]
struct TomlExit {
    direction: String,
    destination: usize,
}

#[derive(Deserialize)]
struct TomlWorld {
    rooms: Vec<TomlRoom>,
}
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