That's great. Thanks for the update.
Keep an eye on it going forward in hot weather. Citrus have a lot of feeder roots near the surface of the soil, and they suck all the moisture, and dry out quickly with the sun beating down on the soil. Sometimes a few handfuls of wood chip mulch on top of the soil will keep the root ball and surface roots cooler. Once the tree is a bit bigger, it will have more canopy to shade its own roots. Keep the mulch an inch or two away from the trunk though. Oh, and don't ever use rock or rubber mulch - they actually heat up the soil and dry it out. Even some leaves or pine needles make a fine mulch to shade the soil and retain moisture.
I'd also suggest whenever you re-pot to consider a white or light colored pot, again to help keep the root ball cooler. From the size of the tree in your pics I wouldn't think you'll need a bigger pot for a year or two. Maybe paint the pot it's in? Know an artist ? ?
