There are 2 things most common, both caused from the brakes getting too hot. The warped rotors I am talking about the thickness of the rotors does not change. The rotor gets wavy. I put the rotor on the the machine to re-surface it and I can watch the bit take metal off of the high spots. Not pad, but metal. As a metallurgical engineer, you should know that when cast iron cools, it is under some internal stress. When it gets hot enough, it has a tendancy to relieve the stress. Better casting methods can limit this problem so it is more likely to happen on cheaper vehicles. It is not common on racing parts.
The second issue I've seen often would cause it to mic different around the circumferance. That is rotor flaking. Once again, the rotors get to hot and the surface will start to flake. Sometimes small flakes that hardly effect driving, sometimes they are quite large. I attribute this to poor materials and I usually only saw this in cheaper aftermarket replacement rotors.

 

Apparently you aren't reading the links. And since you haven't put a micrometer to the rotor and insist on passing on misinformation, I'll spell it out for you.

When pad material deposits on the rotor nonuniformly, it causes the rotors to slip on the pad deposit, and wear the exposed cast iron surface. Over time, this results in the exposed sections getting thinner and the bedded surfaces staying thick. So when you maching the surface, it will appear that the surface is warped.

I'm not saying that a rotor can't warp, but the overwhelming majority of brake chatter cases are not caused by warped rotors. Besides - with a floating caliper a warped rotor wouldn't be as apt to cause brake chatter.

 

Are you sure your problem is on the front and not on the rear? If it's only sensed with light pedal pressure, then it can be hard to tell sometimes. Just a suggestion anyway.