WHR rating grid — ecosystem unit × leading type × structural stage
Enter a WHR class 1–6 per cell (1 = High … 6 = Nil). Each ecosystem
unit is split by leading type (conifer vs deciduous matters for winter shelter).
Click a unit label to set shared confidence / rationale / IK flag. copy↓ copies the
row directly above into this row (replicate a leading type, then tweak).