Update class mechanics, stat rulesets, and CoA reference catalogs

src/game/characterStatRuleset.ts

@@ -0,0 +1,15 @@
+import { isRomClassId, type ClassId } from "../app/characterCatalog";
+
+export type CharacterStatRuleset = "wow" | "rom";
+
+export function isCharacterStatRuleset(value: unknown): value is CharacterStatRuleset {
+  return value === "wow" || value === "rom";
+}
+
+/** Missing or invalid saved/runtime values keep the historical WoW behavior. */
+export function normalizeCharacterStatRuleset(
+  value: unknown,
+  classId: ClassId,
+): CharacterStatRuleset {
+  return value === "rom" && isRomClassId(classId) ? "rom" : "wow";
+}