Crate prikk_ffi 

Prikk’s sole FFI surface (DC-96 Windows Anchor Identity). Every future FFI need lands here rather than motivating a second entry in UNSAFE_EXEMPT_CRATES, which DC-90 forbids anyway – see that gate’s own module doc for why at most one workspace crate may hold this exemption. Compiles to nothing on non-Windows targets: there is no FFI need there today, and this crate exists to hold the one that does, not to anticipate ones that don’t yet.