//! Retry policy.
//!
//! Skeleton only — v0 issues exactly one HTTP request per call and surfaces
//! transport/API failures verbatim. The shape lives here so that v0.2 retry
//! support (exponential backoff + jitter, `Retry-After` honoring, idempotency
//! check) is a localized change rather than a refactor of every call site.
//!
//! See `ROADMAP.md` for the full retry feature list.
use Duration;
/// How retries should be attempted.