Two frames each: the run cycles land where the zombies always were

The live bench session's verdict, in Oliver's words: "this looks better than
anything before." Six and eight real phases at speed read as flicker on a
far-court body — the zombies never had this problem because their walks are
FOUR well-chosen frames at a calm rate, and the fix was to stop out-drawing
them. Each opponent now runs a TWO-frame true leg-swap pair — his frames 1+2
of the grid roll, hers 7+8 of the face-transplant cycle, both picked live on
the bench with SPR swaps — at TUNE.runHz2 = 1.7 (the old hardcoded 4.5 for
short cycles was most of a stride per display frame; that is the strobe).

The tuning rig ships too: TUNE.runN (frame-count override, 0 = probe),
T.SPR for live frame swaps, and the bench's living slots — the next cadence
question gets answered by watching, not rolling. Twelve run sprites become
four; the SPR list says why. SPRV 124, main.js v248.

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

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