completeCookingSession now forwards actualPortionsEaten and
leftoverEstimatePortions (after applying wrapper defaults) into
completeCookingSessionCore, so API callers omitting leftovers get
correct 100% deduction when mealBoxPortions is provided instead of
core's fallback to 0. Added regression test with leftovers omitted.
Sven (AAMOS AI)
c1ab2c8f37