This really rubs me the wrong way. You're not that special. You're not an educational genius who has cracked the code for teaching kids how to read at years above their grade level. You put some effort into it and you have a kid with a great deal of natural ability. This is their achievement, not yours. The title should be "My 3-year-old learned to read like a 9-year-old."
Too many smart parents have smart kids, avoid completely neglecting them, and then talk about how great they are at teaching kids and how stupid The System is for failing to do this. Good on you for being there, and no doubt your effort helped out, but don't kid yourself. Your main contribution here is your DNA.