tuff-hooks-spec

tuff-hooks-spec defines Tuff's canonical hook vocabulary and compatibility matrix types.

The crate is intentionally small and Tuff-owned. It exists so Tuff-standard hooks can be described once and rendered into native harness hook formats where an adapter declares compatible support. Native harness hook fragments remain outside this layer and are passed through by Tuff adapters.

Harness version bounds are optional. When Tuff knows that behavior changed in a specific harness version, adapters can fill in since_harness_version and until_harness_version. When the version is unknown, those fields should remain empty rather than using placeholder values.