Hot Water line Clogs only in Kitchen Sink
Most likely it is shavings and debris from the cutting the guy did into the waterline.

You should turn off the water supply valves and disconnect the water lines from the faucet but not from the valves (  do the cold even though it hasn’t given you problems just for peace of mind ).

Get a bucket and put the end of the supply lines that were attached to the faucet into the bucket and hold onto them while you open the valve and bleed the system for about a minute. ( Open the valves slowly there will be quite a bit of pressure) 

Before you reattach the supply lines to the  faucet  open both the cold and the hot on the faucet, take the aerator out and try to blow backwards through the faucet to blow any debris that might still be left inside the faucet back out. 

Reassemble the faucet reattach the supply lines and see how she goes.