Draw the wind-up from the photographed serve, not from prose

Oliver's idea, and it is the fix for the process as much as for the frames: give
the generator the real serve sequence as an IMAGE and let it copy the poses,
instead of describing a pose in prose and re-rolling until it lands. One
generation — a composite of his five photographed frames over two of our sprites
— returned a magenta row of the whole serve in the game's own character and kit.
The four stages are sliced straight out of it, anchored on the standing figure.

_fine.py gets --defringe: its two de-fringe passes each eat a one-pixel line, and
a racket frame IS a one-pixel line — that is what had been leaving the men holding
a grip and nothing else.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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