Initialize Minecraft text generator project with basic structure and CLI functionality

crates/exporters/Cargo.toml

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+[package]
+name = "exporters"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+lib = { path = "../lib" }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }

crates/exporters/src/lib.rs

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+mod mcfunction;
+
+pub use mcfunction::McFunctionExporter;

crates/exporters/src/mcfunction.rs

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+use std::collections::HashMap;
+
+use lib::{StructureExporter, VoxelType};
+
+pub struct McFunctionExporter {
+    palette: HashMap<VoxelType, String>,
+}
+
+impl McFunctionExporter {
+    pub fn new(body_block: &str, outline_block: &str) -> Self {
+        let mut palette = HashMap::new();
+
+        palette.insert(VoxelType::Body, body_block.to_string());
+        palette.insert(VoxelType::Outline, outline_block.to_string());
+
+        Self { palette }
+    }
+}
+
+impl StructureExporter for McFunctionExporter {
+    fn export(&self, grid: &lib::VoxelGrid) -> anyhow::Result<Vec<u8>> {
+        let mut output = String::new();
+
+        output.push_str(&format!("# Generated by Minecraft Text Builder\n"));
+        output.push_str(&format!(
+            "# Dimensions: {}x{}x{}\n\n",
+            grid.width, grid.height, grid.depth
+        ));
+
+        for z in 0..grid.depth {
+            for y in 0..grid.height {
+                for x in 0..grid.width {
+                    if let Some(voxel_type) = grid.get(x, y, z) {
+                        if let Some(block_id) = self.palette.get(&voxel_type) {
+                            // ~x ~y ~z generates blocks relative to where the command is executed
+                            let command = format!("setblock ~{} ~{} ~{} {}\n", x, y, z, block_id);
+                            output.push_str(&command);
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(output.into_bytes())
+    }
+
+    fn file_extension(&self) -> &'static str {
+        "mcfunction"
+    }
+}