q3: Not. you are likely to move while those files stay the same. Your contact can be useful, but it should be separate from anything legal.
Q4: the COPYRIGHT file should give the full license and no place else. If you relicense in the future it is one place to update. It also means there is less opportunity for a copy/paste error in a place you probably won't examine closely in code review - until a lawyer has you on the stand and you are forced to admit that one file has a difference license.
Hopefully this is all academic: the odds that any of this matter is low. So long as the courts can figure out what you meant that is generally enough that nobody will copy your code illegally (or if they do they will ensure you never find out)
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