Pack runtime core for Greentic runner.

This crate provides the building blocks required to ingest pack indexes, download pack artifacts from multiple backends, verify their integrity, and maintain an on-disk cache that other runtimes can consume. It is not meant to be embedded directly; use greentic-runner/greentic-runner-host, which wrap these helpers with the canonical runtime.

runner-core

Core helpers for the Greentic runner, covering pack resolution/caching, signing & verification, and the shared session/state glue used across runtimes.