IPC frame envelope + Link W / Link F message catalogs and protocol state helpers for superfluid (schema draft 7, §4). Pure protocol crate: no I/O, no sockets.
Engine trait over the draft-7 ABI plus MockEngine: a pure-Rust engine implementing every tick/state-op/registration semantic for tests and the worker skeleton
The generic executor: the Engine tick contract implemented once over a runtime's RuntimePrimitives (batch step, sequences, state export), so an adapter…
What every superfluid runtime adapter is built from: the Runtime trait, the worker executable's main, the check report, installing a runtime from its own…