As a follow up, I calculated the angle change for 1/4" over 12 feet - it is 0.1 degrees. No wonder I couldn't see it with a level. Of course, the wood joists are not infinity rigid, so the actual tweak may have been more local, at the door hinge point and was magnified on the door bottom closer to the latch side.
At any rate, a good lesson for me.
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