Her legs finally swap: the face-transplant cycle ships, and the prompt rules are law now

The female run took the whole evening because the model would not draw her
RUNNING: roll after roll came back with the same leg forward in every frame
— amplitude wiggle, no gait ("she never changes her leg... floating while
strobing"). The set that ships is the FACE TRANSPLANT: her old cycle's poses
(which always alternated properly — swaps at positions 2 and 6, 78%/74%,
where a runner's legs actually cross) redrawn with only the friendly face
and open beds changed. The model returned that roll on a painted CHECKERBOARD
— it has no concept of transparency, the word alone summons the pattern —
and the figures were custom-keyed off it: light checker blanket, dark
checker border-flood only (the dark cell is nearly her skirt colour; the
first blanket pass shredded the pleats), verified whole over a light ground.

Oliver gated every strip by eye. The alternatives lost on their own terms:
hex-only prompts obeyed the background but drew her dainty (max 44%, no
swap); the explicit leg-swap clause got alternation but clustered it in the
back half (step-step-skip). His pick: the transplant.

The lesson is in PROJECT.md now, next to the bed flag: NEVER say
"transparent" to the model — name one flat hex — and never freehand
background prose in one-off scripts; import _regen.py's CANVAS block, which
has said it correctly all along. SPRV 123, main.js v246, all 14 run frames
verified 200.

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

PROJECT.md

@@ -1625,6 +1625,14 @@ suspect is the CUT, not the roll** — the sheets on disk are the evidence, and
 "Only ink votes" below). Seven families shipped pixelated for two days because every fresh look
 started from "the generator drew it badly" instead of diffing sheet against sprite.
 
+**NEVER SAY "TRANSPARENT" TO THE MODEL — name the flat hex (re-learned the hard way 2026-08-14).**
+The model has no concept of transparency: the word summons a PAINTED CHECKERBOARD background, and
+"cuts out later" invites grey improvisations. Every background/bed instruction names ONE concrete
+flat colour ("ONE FLAT solid #FF00FF across the entire canvas") and never mentions cutting,
+keying or transparency. This rule already lived in `_regen.py`'s CANVAS block; a freehand one-off
+prompt bypassed it and cost three rolls — REUSE THE CANVAS BLOCK (import it from `_regen.py`)
+instead of re-writing background prose in scratch scripts.
+
 **STRING BEDS ARE MAGENTA ON PURPOSE, and the cutter must be told (2026-08-14).** Prompts ask for
 #FF00FF racket beds so they cut to transparency (the famroll rule). But `_fine.key` REPAINTS
 enclosed magenta pale grey — protection from the era when magenta beds were an accident — which is