The shared judge both the Download modal and the later-phase engine will use:
core/video/quality_eval.py (pure, isolated) — resolution_rank/resolution_label,
meets_cutoff (loose resolution target), and evaluate_owned(file, profile) →
{meets, resolution_label, reasons[]}. A copy is 'below target' when its resolution
is under the loose cutoff, or its codec is on the reject list.
Exposed as POST /api/video/downloads/evaluate (loads the stored profile, judges the
posted file). 9 tests green, isolation guard green, ruff clean.
