ludic/examples/ecs/world_spawn.ludic

# world_spawn.ludic — EV2b reflection: a mod creates a fresh entity by model id
# (replaces tests/mod_c/world_spawn.c). world_spawn reuses the compiler's own
# spawn lowering (alloc, kind, component defaults, @OnSpawn), so a mod-spawned
# entity is indistinguishable from one born in source. Prints 1 / 42 / 1.
program WorldSpawn {
  property Health { hp: int = 0, max: int = 0 }
  model Unit { Health }
  @Public @OnSpawn(Unit) handler Init { }          # world table; leave defaults

  entry {
    let Um = world_model_id("Unit")
    let e  = world_spawn(Um)                        # the mod creates an entity
    let H  = world_prop_id("Health")
    let hp = world_field_id(H, "hp")
    print(world_has(e, H))          # 1 — spawn attached Health with defaults
    world_set(e, H, hp, 42)
    print(world_get(e, H, hp))      # 42
    print(world_count())            # 1 — it is really in the world
  }
}