T007–T011: implement AdvanceTurn domain logic (pure function, events, invariants, 8 acceptance tests)

packages/domain/src/index.ts

@@ -1 +1,16 @@
-export {};
+export { advanceTurn } from "./advance-turn.js";
+
+export type {
+	DomainEvent,
+	RoundAdvanced,
+	TurnAdvanced,
+} from "./events.js";
+export {
+	type Combatant,
+	type CombatantId,
+	combatantId,
+	createEncounter,
+	type DomainError,
+	type Encounter,
+	isDomainError,
+} from "./types.js";