Overlay and knobs are the check; no checker-generated mask copy.
Sheet is a knob when auto misses. Axis confirm by eye. 1600 is an
after-crop size gate (retake), not a vision slogan. Builds on e2bdd80.
UAT is POC, so #10 is in DOC COMPLETE. Capture knobs live on-screen, review
confidence presentation, 409/422 field recovery, taxonomy cache, portable
Call 1→Call 2, shared validation. U2Net Try harder deferred, not deleted.