Drop the duplicated 13x15 strength matrix and 15x15 roof tables from
qfd.md; the same data already lives in quality-house.md's TikZ source.
qfd.md §3/§4 keep the narrative reading (priority list, conflict list)
and point to quality-house.md for the cells and basement sums. Both
files' regenerate/maintenance notes flipped to reflect the new contract.
c702ba83d8