Dev 155.0.4268.0 - HEVC cannot be played via hardware

Because HEVC still works in Stable but fails in one Edge Dev build across several graphics vendors, treat this as a likely preview regression until diagnostics show otherwise. In the affected Dev build, open edge://gpu and confirm whether Video Decode is hardware accelerated. Then reproduce playback and inspect edge://media-internals to record the codec, decoder name, and any initialization error. HEVC in Edge depends on a working Windows decoder path and a valid HEVC Video Extension, so record whether the extension is installed instead of assuming the GPU alone is responsible. Compare the same clip in Stable without changing the driver first. Keep Dev updated and submit the diagnostic details through Edge Feedback, including the exact Dev version, GPU, driver, codec information, and a reproducible public test source. A temporary Stable-channel workaround is reasonable for affected media, but do not permanently disable graphics acceleration without confirming that it changes the failure.