initial: dungeon crawler with Bun + TypeScript modular architecture

- 19 TypeScript modules under src/ (constants, entities, room, game, render)
- Canvas 2D rendering with dark fantasy palette
- Room-based navigation, random 7x7 map generation
- Two combat modes: ranged (pistol) and melee (knife)
- Wall collision with door opening support
- Minimap, HP bar, enemy AI
- Bun build pipeline: src/main.ts -> dist/main.js + dist/index.html

src/room/Room.ts

@@ -0,0 +1,28 @@
+import type { RoomType, Doors } from '../types';
+import { buildTiles } from './tiles';
+import { Enemy } from '../entities/Enemy';
+import { Tear } from '../entities/Tear';
+
+export class Room {
+  c: number;
+  r: number;
+  type: RoomType;
+  doors: Doors = { up: false, down: false, left: false, right: false };
+  visited = false;
+  cleared = false;
+  enemies: Enemy[] = [];
+  tears: Tear[] = [];
+  tiles: number[][];
+
+  constructor(c: number, r: number, type: RoomType) {
+    this.c = c;
+    this.r = r;
+    this.type = type;
+    this.tiles = buildTiles();
+  }
+
+  /** Rebuild base tiles and optionally place doors if cleared */
+  buildTiles(): void {
+    this.tiles = buildTiles(this.cleared || this.type === 'spawn' ? this.doors : undefined);
+  }
+}