Locks in the source-package guarantee: because Ludic is AOT, a package's
property (component), model, @OnSpawn handler (system) and plain function all
compile into the consumer's compile-time ECS with no ABI seam. The new case
fetches such a package and runs a game that spawns the imported model, reads the
imported component via reflection, relies on the imported system, and calls the
imported function — asserting "50 7".
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>