The silent settings-driven software path cost a debugging round on the
first Vulkan Video glass test (stale decoder=software from the VAAPI-
broken-on-NVIDIA era) — now it says so. Module docs updated: auto is
vulkan → vaapi → software.
Validated on glass (RTX 5070 Ti, HEVC 4K@144): decode 11 ms → 0.1 ms,
e2e p50 ~115 ms → 8.6 ms (the old number was software-decode queueing,
not clock skew), 144 fps locked, 2686 frames, zero errors.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler
6cb97959a2