Implements Glyph (per-cell visual), Element (shared behavior palette),
and Board (60x25 grid of (Glyph, usize) cells). Player walks around
with arrow keys and is blocked by wall elements.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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>
randrews