/**
 * Application context — the dependency carrier for all pipeline operations.
 *
 * Passed to every pipeline step, domain service, and adapter that needs
 * access to infrastructure. Replaces process.env as the state-passing
 * mechanism.
 *
 * Created once per CLI invocation by createAppContext() (composition root).
 * Created per-test by createTestContext().
 *
 * Fields marked optional are transitional — they will become required
 * as downstream consumers are converted to use them.
 */
export {};
