Adds surface_pattern, composition_category, and polarity to the
proposed_change_payload for composition_reclassification proposals so
operators can call apply_composition_claim() without field synthesis.
Dispatch by missing_operator:
- quantity_extraction → multiplicative_composition + bound(count) × bound(unit_cost)
- multi_quantity_composition → additive_composition + bound(qty_a) + bound(qty_b)
All other change kinds (matcher_extension, injector_sub_shape,
frame_reclassification) keep the existing evidence-aggregation payload.
Legacy fields (evidence_count, group_key, modal_sub_type) preserved.
Adds tests/test_contemplation_ratifiable_payload.py with 11 tests
including a round-trip from decompose_audit → apply_composition_claim.
