Serve stance can no longer render mirrored

The sprite file was fine — drawChar mirrors sprites by P.facing, which
persisted from the last run direction, so the pre-serve bounce stance
randomly flipped (racket in the wrong hand, ball beside the wrong hand).
setupPoint now resets both players to the canonical righty stance.

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

game.js

@@ -249,6 +249,7 @@ function setupPoint() {
   sv.z = sv.side === 'P' ? 24.3 : -0.5;
   rc.x = -sv.x; rc.z = rc.side === 'P' ? 22.5 : 1.2;
   P.pose = O.pose = 'idle'; P.swingT = O.swingT = -1;
+  P.facing = O.facing = 1; // canonical righty stance — bounce/serve sprites must not render mirrored
   aiServeT = score.server === 'O' ? 1.4 : 0;
 }