Add an opt-in freeform path where the model draws raw box-layout geometry
({name, boxes:[{x,y,z,w,h,d,color}]}) instead of the recipe, so creatures can
take cross-form shapes (five arms, a house on the head) the closed recipe
vocabulary cannot express. Gemma 4 12B (the model-selection spike winner),
grammar-enforced, seeded with a hand-authored reference exemplar.
Freeform creatures are first-class: they enter the family tree and breed. A
splice routes to a Gemma "merge two creatures" call when either parent carries
boxes (freeform x freeform and freeform x recipe both yield a box child);
otherwise the recipe fuse runs. Fallbacks (fake runtime / model failure) use a
reference exemplar or a deterministic box merge, so the app never renders empty.
- genome: optional Genome.boxes + freeform_genome(); round-trips, recipe
creatures stay box-free
- prompts: BOX_SCHEMA, build_freeform_messages, build_freeform_fuse_messages
- runtime: generate_creature / fuse_creatures on Gemma via per-cal…
