feat(core): add module scaffolding and provider registries

src/core/action-bus.ts

@@ -0,0 +1,21 @@
+export type ActionWithType = { type: string };
+
+export type ActionHandler<TAction extends ActionWithType> = (
+  action: TAction,
+) => void | Promise<void>;
+
+export class ActionBus<TAction extends ActionWithType> {
+  private handlers = new Map<string, ActionHandler<TAction>>();
+
+  register(type: TAction["type"], handler: ActionHandler<TAction>): void {
+    this.handlers.set(type, handler);
+  }
+
+  async dispatch(action: TAction): Promise<void> {
+    const handler = this.handlers.get(action.type);
+    if (!handler) {
+      throw new Error(`No handler registered for action: ${action.type}`);
+    }
+    await handler(action);
+  }
+}