✨Feature: implement dungeon state management with room expansion and exit handling

src/rules/rooms.ts

@@ -4,7 +4,7 @@ import {
   findTableByCode,
 } from "@/data/contentHelpers";
 import type { ContentPack, ExitType, RoomClass } from "@/types/content";
-import type { RoomExitState, RoomState } from "@/types/state";
+import type { DungeonLevelState, RoomExitState, RoomState } from "@/types/state";
 
 import { lookupTable, type TableLookupResult } from "./tables";
 import type { DiceRoller } from "./dice";
@@ -186,7 +186,7 @@ export function generateLevel1StartRoom(
   };
 }
 
-export function createLevelShell(level: number) {
+export function createLevelShell(level: number): DungeonLevelState {
   return {
     level,
     themeName: level === 1 ? "The Entry" : undefined,