Initial project scaffold

Sets up eframe/egui app with basic menu bar and placeholder viewport. Adds Rhai scripting dependency for future game object scripting system.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

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+/target
+.idea/

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project
+
+`viberogue` is a roguelike game written in Rust (edition 2024). It is in early development with no dependencies yet.
+
+## Commands
+
+```bash
+cargo build          # compile
+cargo run            # build and run
+cargo test           # run all tests
+cargo test <name>    # run a single test by name (substring match)
+cargo clippy         # lint
+cargo fmt            # format
+```
+
+## Architecture
+
+The game is a single Rust binary using **eframe 0.33 / egui 0.33** for the GUI. eframe drives a retained-mode UI: the `App::update` method is called every frame and is responsible for both drawing and responding to input.
+
+`update` is structured in two panels:
+- `egui::TopBottomPanel::top` — menu bar (File → Exit)
+- `egui::CentralPanel::default` — game viewport; use `ui.painter()` to draw directly
+
+As the codebase grows, game state will live on the `App` struct and game logic will be split into modules under `src/` (map generation, entities, etc.). Keep game logic separate from the egui drawing calls in `update`.
+
+eframe runs on its own event loop thread; do not assume single-threaded execution.

Cargo.toml

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+[package]
+name = "viberogue"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+eframe = "0.33.3"
+rhai = "1"

src/main.rs

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+use eframe::egui;
+
+fn main() -> eframe::Result<()> {
+    let options = eframe::NativeOptions::default();
+    eframe::run_native(
+        "Viberogue",
+        options,
+        Box::new(|_cc| Ok(Box::new(App::default()))),
+    )
+}
+
+#[derive(Default)]
+struct App;
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::TopBottomPanel::top("menu_bar").show(ctx, |ui| {
+            egui::MenuBar::new().ui(ui, |ui| {
+                ui.menu_button("File", |ui| {
+                    if ui.button("Exit").clicked() {
+                        ctx.send_viewport_cmd(egui::ViewportCommand::Close);
+                    }
+                });
+            });
+        });
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            let rect = ui.available_rect_before_wrap();
+            let center = rect.center();
+            let square = egui::Rect::from_center_size(center, egui::vec2(200.0, 200.0));
+            ui.painter().rect_filled(square, 0.0, egui::Color32::BLUE);
+        });
+    }
+}