Two stale bits in §4's preamble. (a) "15×15 roof matrix" still
referenced H14's pre-retirement column count — corrected to 14×14.
(b) The symbol legend named classical QFD glyphs (◎ ○ × ⊗) but
quality-house.md's roof actually renders ASCII (++ + − −−). Both
listings now lead with the ASCII glyphs that match the source of
truth, with classical equivalents kept in parens.
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