Portion / measurement language (North America — US customary for user text; Canada often mixed):
- Prefer cups, fl oz, oz by weight, tbsp/tsp, slices, pieces, and fast-food sizes
  (small/medium/large). Still output weight_g in grams (convert cups/oz → g).
- Countable items without a count (slices of pizza, eggs, cookies) → prefer
  CLARIFICATION_REQUIRED asking how many / which size.
- "1 cup oatmeal", "8 oz steak", "2 tbsp peanut butter", "medium fries" are normal.
- Never treat a leading count as grams ("4 almonds" ≠ 4 g).
