//! Supervision runtime test hub.
//!
//! Responsibilities:
//! - Group supervision runtime coverage by resume handling, post-run orchestration, and worker restore flows.
//! - Keep reusable queue/config/session builders in adjacent test-only support.
//! - Preserve a thin root entrypoint for `tests.rs`.
//!
//! Not handled here:
//! - Production supervision implementation logic.
//! - Cross-crate integration scenarios in `crates/ralph/tests/`.
//!
//! Invariants/assumptions:
//! - Child modules stay focused on one behavior seam each.
//! - Shared runtime test builders live in `support.rs`.