Rework story engine flow and reorganize project docs

scripts/validate-content.ts

@@ -1,6 +1,6 @@
 import { getCharacterHomeSceneId, getCharacterNpcSceneIds, PRESET_CHARACTERS } from '../src/data/characterPresets.ts';
 import { MONSTER_PRESETS_BY_WORLD } from '../src/data/hostileNpcPresets.ts';
-import { getScenePresetsByWorld } from '../src/data/scenePresets.ts';
+import { getSceneHostileNpcPresetIds, getScenePresetsByWorld } from '../src/data/scenePresets.ts';
 import { buildStateFunctionDefinitions } from '../src/data/stateFunctions.ts';
 import { WorldType } from '../src/types.ts';
 
@@ -32,7 +32,7 @@ function validateScenes(errors: string[]) {
         }
       });
 
-      scene.monsterIds.forEach(monsterId => {
+      getSceneHostileNpcPresetIds(scene).forEach(monsterId => {
         if (!monsterIdSet.has(monsterId)) {
           addError(errors, `[scene] ${scene.id} references unknown monster "${monsterId}" in ${worldType}`);
         }