Rails → roundhouse → Spinel → native binary

roundhouse reads a Rails app without booting it and emits a metaprogramming-free "Ruby shape" of it; with --target spinel that tree is a spin project that Spinel compiles ahead of time to C and then to one executable. Both projects move fast (dozens of commits a day) and are proven on real apps (Campfire, Lobsters), but a large, gem-heavy production app will hit gaps. Treat the work as an iterative campaign: each round fixes a class of failures, some fixes belong in your app-side patch script, and the rest are upstream bugs worth reporting — which is often what moves you forward most.

Set expectations with the user early, because they change what "done" means: