add Count v1 rebar density head (MAE 7.0 stratified, beats SAHI 8.9)

card: profile_width_cnn ≈18.6μm (GPU run variance note)

model card: add conformal checkpoint row

add GaugeHead-Tiny conformal interval checkpoint (M2 v2-b, per-source coverage 0.91/1.00/0.95 @90%)

add GaugeHead-Tiny width head (M2 v2-a, rel.err 0.4724 held-out)

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initial commit