I am so happy to hear your good news! I was very much hoping that your pathology would come back just as it did. My experience with rectal cancer was similar to yours in that they caught it in Stage 1 without escaping the muscle wall. What a relief it was for me to hear that news, so I know how happy, relieved, and thankful you are now.
I am sure you will be diligent with your follow-ups and, in a couple of years, put all of this behind (pun intended) you.
Keep preaching to all that will hear it that early detection through testing is the key to winning the battle against cancer.