feat(contracts): @insignia/iios-contracts — scope, enums, platform ports, CloudEvents, errors

Verbatim IiosPlatformPorts from the bottom-up atlas; orgId/appId required scope
(KG-02); PolicyDeniedError for fail-closed. Vitest as workspace test runner.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/iios-contracts/src/index.ts

@@ -0,0 +1,6 @@
+export * from './scope';
+export * from './enums';
+export * from './ports';
+export * from './events';
+export * from './commands';
+export * from './errors';