Address PR #2056 review feedback:
- Fix totalFrames progress inflation for interleaved tasks — divide
each task's span by its frameStride to match the actual per-worker
frame count (captureFrameRange steps by stride), instead of summing
raw endFrame-startFrame which double(N)-counts interleaved tasks.
- Attach a no-op .catch to each frame's pipelined encodeResult at kick
time so an abandoned promise (loop exits early on abort/error before
draining it) can't surface as an unhandled rejection during teardown.
- Document why the pipelined branch's stride=1 path is validation-only
in production (HF_DE_PARALLEL_STREAM always uses interleaved
distribution) so a future refactor doesn't unknowingly widen it.
- Comment the intentional single shared parallelGuard/parallelStats
across workers (safe single-threaded, better rolling-median signal).
Vance Ingalls
2dbe958a49