The installed skill had drifted ahead of the repo: SKILL.md carried the whole owner-requirements
section and references/hevc-conversion-policy.md was missing here entirely. Synced both.
Also states the boundary the policy needs: this skill's size hunt (SSIM-pinned quality, maxrate
1.0x source video bitrate, bpp tiering, matched audio) is for H.264 / MPEG-4 sources. YouTube's
VP9/AV1 sources are already near-optimal for their quality, so a re-encode can only grow them or
lose quality - the accepted answer there is 'same size, do not chase smaller', and the job reduces
to: never decode with *_cuvid, keep -fps_mode cfr, gate the output on pictures vs the source, and
source any repair from the pre-conversion snapshot backup rather than the converted file.
