Shared types and helpers for the Thirdpass package review system.

thirdpass-core is the library boundary between the CLI, registry extensions, the coordinator, and the server-facing review API. Most users should start with the wire types in [schema] and the extension contracts in [extension].

Feature Flags

• package enables archive download, extraction, workspace preparation, manifest generation, file hashing, line-count analysis, and review target selection helpers in [package].
• registry enables registry lookup helpers in [registry].
• The default feature set keeps the crate limited to schema and extension contracts.

Public API Shape

The crate intentionally exposes a flat package API such as [package::ensure] and [package::SelectedTarget] instead of exposing the internal module layout. Extension authors should use [extension::Extension] and [extension::run_command] when implementing process-backed extensions.