Ah, of course! Thanks, I've won! (Even though it's just a solo game this time...) To be clear, I should:
1 Use all of my food to feed some of my people.
2 Use all of my stone for my building + use luxury goods for my building
3 Use the rest of my luxury goods for some of my people
I think this gets you to the same position but is a little cleaner:
Feed your people:
1. Use all of your food to feed as many of your people as you can.
2. Decide if you want to use any luxury goods to feed some or all of your remaining people - killing any you do not feed.
Build any unbuilt buildings:
3. Use all of your remaining resources + luxury goods for any unbuilt building(s).