feat(commands): type command payload dispatch

commands/index.ts

@@ -1,5 +1,6 @@
 export type { Command, CommandContext } from "./command";
 export type { CommandDispatcher, Dispatch } from "./dispatcher";
+export type { CommandId, CommandPayloads } from "./payloads";
 export { createCommandDispatcher } from "./dispatcher";
 export type { CommandRegistry } from "./registry";
 export { createCommandRegistry } from "./registry";