//! Module: metrics
//!
//! Responsibility: module-local ownership and contracts for metrics.
//! Does not own: cross-module orchestration outside this module.
//! Boundary: exposes this module API while keeping implementation details internal.
//! Observability: runtime telemetry (metrics) and sink abstractions.
//!
//! Storage inspection and execution diagnostics live in `db`.
//! This module is intentionally metrics-focused.
pub
// re-exports
pub use ;
pub use ;
///
/// TESTS
///