uselesskey-core-id

Core identity primitives shared by microcrate-facing and top-level uselesskey APIs.

Purpose

• Model derivation identities (ArtifactId) used for cache keying.
• Derive per-artifact seeds from (master seed, artifact id).
• Re-export [Seed] from uselesskey-core-seed for convenience.

This crate is intentionally small so it can be composed by multiple producers while keeping determinism behavior stable across crate boundaries.