feat(tuning): leaf-on/leaf-off fusion — carve hidden under-canopy hardscape

feat(tuning): drop NAIP from the suite; label leaf-off as DOGIS

feat(tuning): leaf-off reference in labeler + county imagery in Tune

feat(tuning): standalone gold-labeling app for a helper + shared label UI

feat(tuning): reload saved gold mask as an editable layer

feat(tuning): show parcel + to-curb ROW guides in the label tool

fix(tuning): move Gradio theme to launch() for Gradio 6 compatibility

feat(tuning): offline pipeline tuning suite (harness + gold labeler + Gradio cockpit)