e2e 41b finds the ball's bounces by its turning points instead of frames within a pixel of the ground: the ball lands at ~9 px per frame, so whether a drawn frame catches the landing depended on where it fell between two physics steps, and CI missed the first landing and read the second bounce as the first (#147)

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

tools/e2e/41-physics.mjs

@@ -182,20 +182,15 @@ export async function physics(t) {
     samples.length > 100 && samples[0].crate < REST - 50 && last.every((y) => Math.abs(y - REST) < 1),
     JSON.stringify({ frames: samples.length, first: samples[0], last: last.slice(-3), rest: REST }),
   );
-  // The heights the ball climbs back to: the highest point between two landings.
+  // The heights the ball climbs back to: every turn from rising to falling after the first landing.
+  // Turning points, not a threshold at the ground: the ball lands at ~9 px per frame, and whether a
+  // drawn frame comes within a pixel of the landing depends on where it falls between two steps.
   const peaks = [];
-  let landings = 0;
+  let landed = false;
-  let down = false;
+  for (let i = 1; i < samples.length - 1; i++) {
-  let top = Infinity;
+    const [before, y, after] = [samples[i - 1].ball, samples[i].ball, samples[i + 1].ball];
-  for (const { ball } of samples) {
+    if (y >= before && y > after) landed = true;
-    if (ball > REST - 1) {
+    else if (landed && y <= before && y < after && REST - y > 2) peaks.push(REST - y);
-      if (!down && landings++ > 0 && Number.isFinite(top)) peaks.push(REST - top);
-      down = true;
-      top = Infinity;
-    } else {
-      down = false;
-      if (landings > 0) top = Math.min(top, ball);
-    }
   }
   const drop = REST - Y;
   check(