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James Russo
17f47f30dd
After #916 moved `assertSwiftShader` from `renderChunk()`'s eager probe session into `executeWorkerTask`, every parallel worker began running its own `chrome://gpu` / canvas-WebGL probe. At `chunkWorkerCount=6` (texture launch at chunks=3) that's 6 concurrent CDP page-loads per chunk × 3 chunks = 18 simultaneous probes. Bench data on dev (12 producer pods × 22 vCPU) showed c=3 worst-case wall-clock at 67.3s, 24.7s above c=6 worst (42.6s) — pod_total inflates 100s → 147s uniformly across all three chunks per slow iter, the signature of cluster-level CDP contention rather than within-pod contention. Workers within a chunk share the same Chrome binary, flags, and OS/driver state on a single pod, so worker 0's success is representative for the rest. Gate the probe via `shouldVerifyWorkerGpu(workerId, config)` so only worker 0 navigates to the probe page; workers 1..N-1 skip it. The fail-fast contract still holds at the chunk level (worker 0 still aborts the chunk if SwiftShader didn't load) — just without the concurrent CDP traffic. Expected wall-clock impact: c=3 worst drops from ~67s to in line with c=6 worst (~42-44s). c=6 (3 workers/pod) and c=8 (2 workers/pod) should see smaller wins; c=12 (1 worker/pod, sequential branch) is unaffected. Closes #955.