chore(tools): no-store meta on report so local reloads aren't stale

fix(tools): opaque controls bar so scrolled cells don't bleed through

fix(tools): sticky matrix header + English-only report

data(tools): add MiniCPM4.1-8B eval sweep (8/8 valid)

feat(tools): same-model overwrite on eval merge

feat(tools): add View menu + model×theme matrix to the eval report

feat(tools): add voxel-model-eval harness + skill