test(producer): address review feedback on parallel capture test

- Add fixture to shard-5 in regression.yml so CI actually runs it
- Reframe description: multi-worker path coverage (frame distribution,
  reorder buffer, per-worker browser lifecycle), not GPU-specific crash
  guard — SwiftShader CI can't reproduce the hardware compositor race
- Remove dead @Keyframes count-up (content doesn't apply to div)
- Remove unused CSS animation reference on .counter
- Regenerate golden baseline with cleaned-up HTML

Author: miguel-heygen

.github/workflows/regression.yml

@@ -73,7 +73,7 @@ jobs:
           - shard: shard-4
             args: "style-16-prod style-9-prod style-17-prod iframe-render-compat variables-prod mp4-h265-sdr"
           - shard: shard-5
-            args: "style-4-prod style-11-prod style-2-prod animejs-adapter typegpu-adapter"
+            args: "style-4-prod style-11-prod style-2-prod animejs-adapter typegpu-adapter parallel-capture-regression"
           - shard: shard-6
             args: "overlay-montage-prod style-12-prod chat missing-host-comp-id png-sequence"
           - shard: shard-7

packages/producer/tests/parallel-capture-regression/meta.json

@@ -1,6 +1,6 @@
 {
   "name": "parallel-capture-regression",
-  "description": "Regression test for multi-worker parallel capture. Exercises the browser-per-worker code path that prevents BeginFrame compositor races. Must render with workers > 1 to be meaningful.",
+  "description": "Multi-worker parallel capture path coverage. Exercises frame distribution, reorder buffer, and per-worker browser lifecycle at workers > 1. Guards against regressions in executeParallelCapture and the streaming encoder's ordered-write path. Note: the GPU-specific BeginFrame compositor race (#1087) only reproduces on hardware-GPU hosts, not in SwiftShader CI.",
   "tags": ["regression", "parallel", "render-compat"],
   "minPsnr": 30,
   "maxFrameFailures": 0,

packages/producer/tests/parallel-capture-regression/output/compiled.html

@@ -55,7 +55,6 @@
     background: linear-gradient(135deg, #58a6ff, #bc8cff);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
-    animation: count-up 5s steps(5, end) forwards;
   }
 
   .pulse-ring {
@@ -81,15 +80,6 @@
     50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.15); }
   }
 
-  @keyframes count-up {
-    0%   { content: "0"; }
-    20%  { content: "1"; }
-    40%  { content: "2"; }
-    60%  { content: "3"; }
-    80%  { content: "4"; }
-    100% { content: "5"; }
-  }
-
   .stripe-bg {
     position: absolute;
     inset: 0;

packages/producer/tests/parallel-capture-regression/output/output.mp4

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b33f5ba567a8df551c85b2008482400c9ca10e402379b22cd35b1722148c1046
-size 1185810
+oid sha256:f717cf22344ed7c4792e22db0dd9340dd9b845ce04ced0b60410b58344855ca0
+size 1186833

packages/producer/tests/parallel-capture-regression/src/index.html

@@ -55,7 +55,6 @@
     background: linear-gradient(135deg, #58a6ff, #bc8cff);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
-    animation: count-up 5s steps(5, end) forwards;
   }
 
   .pulse-ring {
@@ -81,15 +80,6 @@
     50% { opacity: 0.8; transform: translate(-50%, -50%) scale(1.15); }
   }
 
-  @keyframes count-up {
-    0%   { content: "0"; }
-    20%  { content: "1"; }
-    40%  { content: "2"; }
-    60%  { content: "3"; }
-    80%  { content: "4"; }
-    100% { content: "5"; }
-  }
-
   .stripe-bg {
     position: absolute;
     inset: 0;