feat: migrate diplomacy logic to new module and update imports

packages/logic/src/index.ts

@@ -2,6 +2,7 @@ export * from './domain/entities.js';
 export type { RandomGenerator } from '@sammo-ts/common';
 export * from './actions/index.js';
 export * from './constraints/index.js';
+export * from './diplomacy/index.js';
 export * from './logging/index.js';
 export * from './messages/index.js';
 export * from './items/index.js';