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Via
97e094621f
Field signals ts=1784049136 (hardware-GPU intermittent black rectangles → resolved with --no-browser-gpu --low-memory-mode --workers 1) and ts=1784032286 (clip-path animated image → intermittent black rectangles → resolved with deterministic precompose). Pattern: hardware-GPU writes solid-black on some composition shapes; software-GPU / screenshot bypass restores correctness. Raw per-pixel diff alone false-positives on every compositor jitter frame; the diagnostic-grade signal is asymmetric black-only-in-A pixels (solid-black where B has content). Adds `packages/engine/src/utils/gpuParityDiff.ts`: pure helpers (`diffGpuParityFrames`, `diffGpuParityPngs`, `verifyGpuParity`) that compare two RGBA frames captured via different GPU paths, count per-pixel diffs above a tolerance, and isolate black-only-in-A / black-only-in-B pixel counts + bounding boxes. Symmetric black regions (real black content present in both captures) are NOT flagged. PNG wrapper preserves the underlying decode error as Error.cause on either side. All exposed via `@hyperframes/engine`'s package index for downstream wiring. 19 unit tests cover identity, per-pixel tolerance, the field-bug shape, the shared-black no-op case, bounding-box tightness across multiple regions, the inverse pattern, dimension mismatch, data-length mismatch, overlapping threshold rejection, custom tolerance, verdict output, PNG end-to-end, and cause-preservation on both A and B decode failures. Reduced-scope first pass. Wiring a `hyperframes verify-gpu-parity` CLI command, dual-mode capture orchestration, and integration coverage against a known-bad composition is intentionally deferred to a follow-up so the diagnostic primitive can land and be exercised in isolation. The exported surface is stable — a follow-up need only add the capture-and-diff driver. Stack: PR #7 of 9 (base via/parallel-capture-observability). Signed-off-by: Via