diff --git a/docs/README.md b/docs/README.md
index 46dda4d..9a5b25a 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -21,9 +21,8 @@
 
 | Doc | What's in it |
 | --- | --- |
-| [`qfd.md`](qfd.md) | Quality Function Deployment — turns user-facing requirements into technical HOWs. |
-| [`quality-house.md`](quality-house.md) | The 14 WHATs × 14 HOWs House of Quality, filled in. |
-| [`quality-house-empty.md`](quality-house-empty.md) | The same chassis, blank — for re-scoring from scratch. |
+| [`qfd.md`](qfd.md) | Quality Function Deployment — turns user-facing requirements into technical HOWs; §3 is the filled 14 WHATs × 14 HOWs House of Quality. |
+| [`quality-house-empty.md`](quality-house-empty.md) | The House chassis, blank — for re-scoring from scratch. |
 
 ## Bench work
 
diff --git a/docs/qfd.md b/docs/qfd.md
index d41c838..0fe69bf 100644
--- a/docs/qfd.md
+++ b/docs/qfd.md
@@ -15,11 +15,12 @@ with the v0.2–v1.0 trajectory ([README](../README.md),
 glossary at [`../CONTEXT.md`](../CONTEXT.md).
 
 Format inspired by the classic House of Quality, kept compact. Strength
-weights: **9** strong, **3** medium, **1** weak, blank none. The §3
-matrix and §4 roof — plus a guessed competitor perception zone — live
-in [`quality-house.md`](quality-house.md); this file owns the WHAT/HOW
-catalogues (§1, §2), the narrative reading of the numbers (§3, §4), and
-the downstream sections (§5–§8).
+weights: **9** strong, **3** medium, **1** weak, blank none. This one file
+owns everything: the WHAT/HOW catalogues (§1, §2); the House diagram itself —
+matrix, roof, basement Σ, and the guessed competitor perception zone — in §3;
+the narrative reading of the numbers (§3, §4); and the downstream sections
+(§5–§8). (The House was a separate `quality-house.md` until 2026-07-11, merged
+into §3 to end the mirror-drift between the two files.)
 
 ---
 
@@ -104,11 +105,580 @@ Breakdown + levers: [`notes/boot-time-budget.md`](notes/boot-time-budget.md).
 
 ## 3. House of Quality — WHATs × HOWs
 
-The matrix (row × column = how strongly characteristic H advances requirement
-W) and its Σ row — the weighted vote `Σ(weight × strength)` on which
-characteristics deserve the most engineering attention — live in
-[`quality-house.md`](quality-house.md). The Σ totals quoted below are
-from its basement row.
+This section is the House itself: §1's WHATs (rows) × §2's HOWs (columns), each
+cell scoring how strongly a characteristic advances a requirement (9 / 3 / 1 /
+blank). The roof carries the §4 HOW-vs-HOW correlations; the basement carries the
+v0.1 targets (from §2), the weighted-vote sums `Σ = Σ(W weight × cell strength)`,
+and rounded relative weights. The right-hand zone scores five products against
+the WHATs (0–5, **guessed, not measured** — see
+[Perception scores](#perception-scores-guessed)). The Σ totals quoted in the
+priority list below come from the basement.
+
+> **Single source of truth.** The `\foreach` blocks in the diagram restate §1's
+> weights and §2's targets — TikZ can't read the tables, so keep them in sync when
+> either changes, and **recompute the basement Σ / Rel % here** (see
+> [Regenerating](#regenerating)) rather than transcribing them from elsewhere.
+> This mirror used to live in a separate `quality-house.md`; it was merged into §3
+> on 2026-07-11 so the two can no longer silently drift.
+
+For a blank version of the same chassis (WHATs, HOWs, importance, and v0.1
+targets kept; relations + roof + Σ basement left empty for practice), see
+[`quality-house-empty.md`](quality-house-empty.md).
+
+```tikz
+% =====================================================================
+% QFD "House of Quality" preamble
+% =====================================================================
+\usetikzlibrary{arrows.meta, positioning, shapes.geometric, shapes.misc, calc, fit, backgrounds}
+
+\newif\ifqfdshowroof          \qfdshowrooftrue
+\newif\ifqfdshowbasement      \qfdshowbasementtrue
+\newif\ifqfdshowcompetitive   \qfdshowcompetitivetrue
+\newif\ifqfdshowlegend        \qfdshowlegendtrue
+\newif\ifqfdshowimportance    \qfdshowimportancetrue
+\newif\ifqfdshowcorrlegend    \qfdshowcorrlegendtrue
+\newif\ifqfdshowevallegend    \qfdshowevallegendtrue
+
+\def\qfdNW{5}
+\def\qfdNH{5}
+\def\qfdWhatW{4.0}
+\def\qfdImpW{0.9}
+\def\qfdCmpW{3}
+\def\qfdHdrH{2.6}
+\def\qfdBasementN{4}
+
+\def\qfdWhatsTitle{Customer needs}
+\def\qfdImpTitle{Imp.\ \%}
+\def\qfdPerceptionTitle{Comparative evaluation}
+\def\qfdPoorLabel{poor}
+\def\qfdExcellentLabel{excellent}
+\def\qfdAltOneLabel{Typoena}
+\def\qfdAltTwoLabel{Competitor A}
+\def\qfdAltThreeLabel{Competitor B}
+\def\qfdRelTitle{Relation}
+\def\qfdCorrTitle{Correlation}
+\def\qfdEvalTitle{Evaluation}
+
+\tikzset{
+  qfdthin/.style ={line width=0.35pt},
+  qfdmed/.style  ={line width=0.7pt},
+  qfdstrong/.style={circle, draw, fill=black,
+                    minimum size=7pt, inner sep=0pt},
+  qfdmod/.style  ={circle, draw,
+                    minimum size=7pt, inner sep=0pt, line width=0.8pt},
+  qfdweak/.style ={regular polygon, regular polygon sides=3, draw,
+                    minimum size=8.5pt, inner sep=0pt, line width=0.7pt},
+  qfdrel/.is choice,
+  qfdrel/S/.style={qfdstrong},
+  qfdrel/M/.style={qfdmod},
+  qfdrel/W/.style={qfdweak},
+  qfdalt1mk/.style={circle, draw, fill=black,
+                    minimum size=6pt, inner sep=0pt, line width=1pt},
+  qfdalt1ln/.style={line width=1.2pt},
+  qfdalt2mk/.style={regular polygon, regular polygon sides=3, draw,
+                    fill=black, minimum size=6pt, inner sep=0pt,
+                    line width=0.7pt},
+  qfdalt2ln/.style={line width=0.7pt, dashed},
+  qfdalt3mk/.style={rectangle, draw, fill=black,
+                    minimum size=5pt, inner sep=0pt, line width=0.7pt},
+  qfdalt3ln/.style={line width=0.7pt, dotted},
+}
+
+\newcommand{\qfdDrawGrid}{%
+  \foreach \c in {1,...,\qfdNHm} \draw[qfdthin] (\c, 0) -- (\c, -\qfdNW);
+  \foreach \r in {1,...,\qfdNWm} \draw[qfdthin] (0, -\r) -- (\qfdNH, -\r);
+  \foreach \r in {1,...,\qfdNWm}
+    \draw[qfdthin] (\qfdLeftEdge, -\r) -- (0, -\r);
+  \ifqfdshowroof
+    \foreach \c in {1,...,\qfdNHm}
+      \draw[qfdthin] (\c, 0) -- (\c, \qfdHdrH);
+  \fi
+  \ifqfdshowcompetitive
+    \foreach \r in {1,...,\qfdNWm}
+      \draw[qfdthin] (\qfdNH, -\r) -- (\qfdNH+\qfdCmpW, -\r);
+  \fi
+  \ifqfdshowbasement
+    \foreach \r in {1,...,\qfdBasementN}
+      \draw[qfdthin] (0, -\qfdNW-\r) -- (\qfdNH, -\qfdNW-\r);
+    \foreach \c in {1,...,\qfdNHm}
+      \draw[qfdthin] (\c, -\qfdNW) -- (\c, -\qfdNW-\qfdBasementN);
+  \fi
+}
+
+\newcommand{\qfdDrawRoof}{%
+  \ifqfdshowroof
+    \foreach \k in {1,...,\qfdNHm} {%
+      \pgfmathsetmacro{\rx}{(\k+\qfdNH)/2}
+      \pgfmathsetmacro{\ry}{\qfdHdrH + (\qfdNH-\k)/2}
+      \pgfmathsetmacro{\lx}{\k/2}
+      \pgfmathsetmacro{\ly}{\qfdHdrH + \k/2}
+      \draw[qfdthin] (\k, \qfdHdrH) -- (\rx, \ry);
+      \draw[qfdthin] (\k, \qfdHdrH) -- (\lx, \ly);
+    }%
+    \draw[qfdmed] (0, \qfdHdrH)
+       -- (\qfdNH/2, \qfdApexY) -- (\qfdNH, \qfdHdrH);
+    \foreach \i in {1,...,\qfdNH}
+      \foreach \k in {1,...,\qfdNH} {%
+        \pgfmathtruncatemacro{\jj}{\i+\k}
+        \ifnum\jj>\qfdNH\relax\else
+          \pgfmathsetmacro{\xx}{\i + \k/2 - 0.5}
+          \pgfmathsetmacro{\yy}{\qfdHdrH + \k/2}
+          \coordinate (C-\i-\jj) at (\xx, \yy);
+        \fi
+      }%
+  \fi
+}
+
+\newcommand{\qfdDrawScale}{%
+  \ifqfdshowcompetitive
+    \foreach \tk in {0,1,2,3,4,5} {%
+      \pgfmathsetmacro{\tx}{\qfdNH + (\tk+0.5)*\qfdCmpW/6}
+      \node[anchor=south, font=\scriptsize] at (\tx, 0.02) {\tk};
+    }%
+    \node[anchor=south, font=\scriptsize\bfseries, align=center,
+          text width=\qfdCmpW cm]
+         at ({\qfdNH + \qfdCmpW/2}, 0.7) {\qfdPerceptionTitle};
+    \node[anchor=north, font=\scriptsize\itshape]
+         at ({\qfdNH + 0.45}, -\qfdNW) {\qfdPoorLabel};
+    \node[anchor=north, font=\scriptsize\itshape]
+         at ({\qfdNH + \qfdCmpW - 0.45}, -\qfdNW) {\qfdExcellentLabel};
+  \fi
+}
+
+\newcommand{\qfdDrawZoneTitles}{%
+  \ifqfdshowimportance
+    \node[rotate=90, anchor=west, font=\footnotesize\bfseries]
+         at ({-\qfdImpW/2}, 0.12) {\qfdImpTitle};
+  \fi
+  \node[font=\scriptsize\bfseries, align=center, text width=\qfdWhatW cm]
+       at ({\qfdLeftEdge + \qfdWhatW/2},
+           {\ifqfdshowroof \qfdHdrH/2 \else 0.6 \fi}) {\qfdWhatsTitle};
+}
+
+\newcommand{\qfdDrawFrames}{%
+  \begin{scope}[qfdmed]
+    \draw (\qfdLeftEdge, 0) rectangle (\qfdNH, -\qfdNW);
+    \ifqfdshowimportance \draw (-\qfdImpW, 0) -- (-\qfdImpW, -\qfdNW); \fi
+    \draw (0, 0) -- (0, -\qfdNW);
+    \ifqfdshowroof
+      \draw (0, 0) rectangle (\qfdNH, \qfdHdrH); \fi
+    \ifqfdshowbasement
+      \draw (0, -\qfdNW) rectangle (\qfdNH, -\qfdNW-\qfdBasementN); \fi
+    \ifqfdshowcompetitive
+      \draw (\qfdNH, 0) rectangle (\qfdNH+\qfdCmpW, -\qfdNW); \fi
+  \end{scope}
+}
+
+\newcommand{\qfdDrawLegend}{%
+  \ifqfdshowlegend
+    \pgfmathsetmacro{\qfdLegX}{%
+      \qfdNH + \ifqfdshowcompetitive \qfdCmpW + 0.7 \else 0.7 \fi}
+    \pgfmathsetmacro{\qfdLegBottom}{%
+      -2.05
+      \ifqfdshowroof    \ifqfdshowcorrlegend - 2.55 \fi \fi
+      \ifqfdshowcompetitive \ifqfdshowevallegend - 2.20 \fi \fi}
+    \pgfmathsetmacro{\qfdLegY}{\qfdHdrH - 0.4}
+    \begin{scope}[shift={(\qfdLegX, \qfdLegY)}]
+      \draw[qfdmed, rounded corners=2pt]
+        (-0.15, 0.4) rectangle (4.5, \qfdLegBottom);
+      \node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
+        {\qfdRelTitle};
+      \draw[qfdthin] (0, -0.15) -- (4.35, -0.15);
+      \node[qfdstrong] at (0.22, -0.5)  {};
+        \node[anchor=west] at (0.5, -0.5)  {Strong (9)};
+      \node[qfdmod]    at (0.22, -0.95) {};
+        \node[anchor=west] at (0.5, -0.95) {Medium (3)};
+      \node[qfdweak]   at (0.22, -1.4)  {};
+        \node[anchor=west] at (0.5, -1.4)  {Weak (1)};
+      \ifqfdshowroof \ifqfdshowcorrlegend
+        \node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
+          {\qfdCorrTitle};
+        \draw[qfdthin] (0, -2.35) -- (4.35, -2.35);
+        \node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
+        \node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
+        \node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
+        \node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
+      \fi \fi
+      \ifqfdshowcompetitive \ifqfdshowevallegend
+        \pgfmathsetmacro{\qfdEvalTop}{%
+          -2.10 \ifqfdshowroof\ifqfdshowcorrlegend - 2.55 \fi\fi}
+        \node[anchor=west, font=\footnotesize\bfseries]
+          at (0, \qfdEvalTop) {\qfdEvalTitle};
+        \pgfmathsetmacro{\qfdEvalSep}{\qfdEvalTop - 0.25}
+        \draw[qfdthin] (0, \qfdEvalSep) -- (4.35, \qfdEvalSep);
+        \pgfmathsetmacro{\qfdLegA}{\qfdEvalTop - 0.55}
+        \draw[qfdalt1ln] (0.05, \qfdLegA) -- (0.45, \qfdLegA);
+          \node[qfdalt1mk] at (0.25, \qfdLegA) {};
+          \node[anchor=west, font=\bfseries] at (0.55, \qfdLegA)
+            {\qfdAltOneLabel};
+        \pgfmathsetmacro{\qfdLegB}{\qfdEvalTop - 0.95}
+        \draw[qfdalt2ln] (0.05, \qfdLegB) -- (0.45, \qfdLegB);
+          \node[qfdalt2mk] at (0.25, \qfdLegB) {};
+          \node[anchor=west] at (0.55, \qfdLegB) {\qfdAltTwoLabel};
+        \pgfmathsetmacro{\qfdLegC}{\qfdEvalTop - 1.35}
+        \draw[qfdalt3ln] (0.05, \qfdLegC) -- (0.45, \qfdLegC);
+          \node[qfdalt3mk] at (0.25, \qfdLegC) {};
+          \node[anchor=west] at (0.55, \qfdLegC) {\qfdAltThreeLabel};
+      \fi \fi
+    \end{scope}
+  \fi
+}
+
+\newenvironment{qfdhouse}{%
+  \begin{tikzpicture}[x=1cm, y=1cm, font=\scriptsize,
+                      line cap=round, line join=round]
+  \ifqfdshowimportance
+    \pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW-\qfdImpW}
+  \else
+    \pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW}
+  \fi
+  \pgfmathsetmacro{\qfdApexY}{\qfdHdrH + \qfdNH/2}
+  \pgfmathtruncatemacro{\qfdNHm}{\qfdNH - 1}
+  \pgfmathtruncatemacro{\qfdNWm}{\qfdNW - 1}
+  \qfdDrawGrid
+  \qfdDrawRoof
+  \qfdDrawScale
+  \qfdDrawZoneTitles
+}{%
+  \qfdDrawFrames
+  \qfdDrawLegend
+  \end{tikzpicture}%
+}
+
+% --- Dimensions tuned for the typewriter QFD (14 W x 15 H) ---
+\def\qfdNW{14}
+\def\qfdNH{14}
+\def\qfdWhatW{4.6}
+\def\qfdImpW{0.7}
+\def\qfdHdrH{5.0}
+\def\qfdBasementN{3}
+\def\qfdCmpW{3.4}
+\qfdshowlegendfalse                 % we draw a 4-alternative legend manually
+
+\def\qfdWhatsTitle{User-facing requirements (W)}
+\def\qfdImpTitle{Weight}
+\def\qfdPerceptionTitle{Competitive perception\\(0–5, guessed)}
+\def\qfdPoorLabel{poor}
+\def\qfdExcellentLabel{excellent}
+
+% Perception-zone markers: shape + colour-blind-safe colour per product.
+% Palette is Okabe-Ito (blue, vermillion, bluish green, reddish purple).
+% Light fills + saturated outlines keep stacked markers legible.
+\definecolor{qfdcTypoena}{RGB}{0,114,178}
+\definecolor{qfdcRem}{RGB}{213,94,0}
+\definecolor{qfdcFrw}{RGB}{0,158,115}
+\definecolor{qfdcPom}{RGB}{204,121,167}
+\definecolor{qfdcFrwS}{RGB}{86,180,233}
+
+\tikzset{
+  qfdalt1mk/.style={circle, draw=qfdcTypoena, fill=qfdcTypoena!55!white,
+                    minimum size=6.5pt, inner sep=0pt, line width=1.1pt},
+  qfdalt1ln/.style={line width=1.2pt, qfdcTypoena},
+  qfdalt2mk/.style={regular polygon, regular polygon sides=3,
+                    draw=qfdcRem, fill=qfdcRem!55!white,
+                    minimum size=7pt, inner sep=0pt, line width=0.9pt},
+  qfdalt2ln/.style={line width=0.8pt, dashed, qfdcRem},
+  qfdalt3mk/.style={rectangle, draw=qfdcFrw, fill=qfdcFrw!55!white,
+                    minimum size=5.5pt, inner sep=0pt, line width=0.9pt},
+  qfdalt3ln/.style={line width=0.8pt, dotted, qfdcFrw},
+  qfdalt4mk/.style={diamond, aspect=1, draw=qfdcPom,
+                    fill=qfdcPom!50!white,
+                    minimum size=7pt, inner sep=0pt, line width=1.0pt},
+  qfdalt4ln/.style={line width=0.8pt, dash dot, qfdcPom},
+  qfdalt5mk/.style={regular polygon, regular polygon sides=5,
+                    draw=qfdcFrwS, fill=qfdcFrwS!40!white,
+                    minimum size=5.5pt, inner sep=0pt, line width=0.8pt},
+  qfdalt5ln/.style={line width=0.7pt, dash dot dot, qfdcFrwS},
+}
+
+\begin{document}
+\begin{qfdhouse}
+
+  % ---------- WHATs (left column) ----------
+  % Box width is 0.2 cm narrower than the column so labels have 0.1 cm
+  % clearance on each side and don't bleed into the Weight column.
+  \pgfmathsetmacro{\qfdWhatTextW}{\qfdWhatW - 0.2}
+  \foreach \r/\t in {%
+    1/{W1 Sub-second visible response to typing},
+    2/{W2 Publishing is one deliberate action away},
+    3/{W3 Pulling power never corrupts the file},
+    4/{W4 Provisioning never interrupts a writing session},
+    5/{W5 Quick boot to a writing cursor},
+    6/{W6 Long sessions without crash, lag, drift},
+    7/{W7 Nothing on the device competes with prose},
+    8/{W8 The UI never moves except when I move it},
+    9/{W9 Codebase absorbs the planned roadmap},
+    10/{W10 I can repair or fork it with hobbyist tools},
+    11/{W11 Multi-day battery life (v0.8 onward)},
+    12/{W12 Local-only files coexist with git scope (v0.5+)},
+    13/{W13 Typography sets a writing-tool tone},
+    14/{W14 I can carry the device and write away from a desk}%
+  }
+    \node[anchor=west, font=\scriptsize,
+          text width=\qfdWhatTextW cm, align=left]
+      at ({\qfdLeftEdge + 0.1}, {-\r + 0.5}) {\t};
+
+  % ---------- Importance (raw 1-10 weight) ----------
+  \foreach \r/\w in {1/10, 2/9, 3/10, 4/7, 5/6, 6/9, 7/8, 8/7,
+                     9/8, 10/5, 11/4, 12/5, 13/7, 14/8}
+    \node[font=\scriptsize] at ({-\qfdImpW/2}, {-\r + 0.5}) {\w};
+
+  % ---------- HOWs (rotated column titles) ----------
+  \foreach \c/\t in {%
+    1/{H1 Type latency},
+    2/{H2 Refresh area per keystroke},
+    3/{H3 Full-refresh cadence},
+    4/{H4 Boot latency (cold)},
+    5/{H5 Continuous-typing endurance},
+    6/{H6 Publish reliability},
+    7/{H7 Publish latency},
+    8/{H8 Save durability},
+    9/{H9 PSRAM heap headroom},
+    10/{H10 Firmware binary size},
+    11/{H11 Total stack budget},
+    12/{H12 Network reconnect time},
+    13/{H13 Idle / typing / push current},
+    14/{H15 Clean release build time}%
+  }
+    \node[rotate=90, anchor=west, font=\scriptsize]
+      at ({\c - 0.5}, 0.15) {\t};
+
+  % ---------- Relation matrix (S=9, M=3, W=1) ----------
+  % W1 row 1: H1S H2S H3M H5M H9W H11W
+  \node[qfdrel/S] at ({1 - 0.5},  {-1 + 0.5}) {};
+  \node[qfdrel/S] at ({2 - 0.5},  {-1 + 0.5}) {};
+  \node[qfdrel/M] at ({3 - 0.5},  {-1 + 0.5}) {};
+  \node[qfdrel/M] at ({5 - 0.5},  {-1 + 0.5}) {};
+  \node[qfdrel/W] at ({9 - 0.5},  {-1 + 0.5}) {};
+  \node[qfdrel/W] at ({11 - 0.5}, {-1 + 0.5}) {};
+
+  % W2 row 2: H6S H7M H9S H12S
+  \node[qfdrel/S] at ({6 - 0.5},  {-2 + 0.5}) {};
+  \node[qfdrel/M] at ({7 - 0.5},  {-2 + 0.5}) {};
+  \node[qfdrel/S] at ({9 - 0.5},  {-2 + 0.5}) {};
+  \node[qfdrel/S] at ({12 - 0.5}, {-2 + 0.5}) {};
+
+  % W3 row 3: H8S
+  \node[qfdrel/S] at ({8 - 0.5},  {-3 + 0.5}) {};
+
+  % W4 row 4: H6M H12M
+  \node[qfdrel/M] at ({6 - 0.5},  {-4 + 0.5}) {};
+  \node[qfdrel/M] at ({12 - 0.5}, {-4 + 0.5}) {};
+
+  % W5 row 5: H4S H10M
+  \node[qfdrel/S] at ({4 - 0.5},  {-5 + 0.5}) {};
+  \node[qfdrel/M] at ({10 - 0.5}, {-5 + 0.5}) {};
+
+  % W6 row 6: H1M H3M H5S H6M H8M H9S H11M H12M
+  \node[qfdrel/M] at ({1 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/M] at ({3 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/S] at ({5 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/M] at ({6 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/M] at ({8 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/S] at ({9 - 0.5},  {-6 + 0.5}) {};
+  \node[qfdrel/M] at ({11 - 0.5}, {-6 + 0.5}) {};
+  \node[qfdrel/M] at ({12 - 0.5}, {-6 + 0.5}) {};
+
+  % W7 row 7: H1M H2M H3M H13M
+  \node[qfdrel/M] at ({1 - 0.5},  {-7 + 0.5}) {};
+  \node[qfdrel/M] at ({2 - 0.5},  {-7 + 0.5}) {};
+  \node[qfdrel/M] at ({3 - 0.5},  {-7 + 0.5}) {};
+  \node[qfdrel/M] at ({13 - 0.5}, {-7 + 0.5}) {};
+
+  % W8 row 8: H1W H2S H3S
+  \node[qfdrel/W] at ({1 - 0.5},  {-8 + 0.5}) {};
+  \node[qfdrel/S] at ({2 - 0.5},  {-8 + 0.5}) {};
+  \node[qfdrel/S] at ({3 - 0.5},  {-8 + 0.5}) {};
+
+  % W9 row 9: H10W H11W H15M
+  \node[qfdrel/W] at ({10 - 0.5}, {-9 + 0.5}) {};
+  \node[qfdrel/W] at ({11 - 0.5}, {-9 + 0.5}) {};
+  \node[qfdrel/M] at ({14 - 0.5}, {-9 + 0.5}) {};
+
+  % W10 row 10: H10M H13W H15W
+  \node[qfdrel/M] at ({10 - 0.5}, {-10 + 0.5}) {};
+  \node[qfdrel/W] at ({13 - 0.5}, {-10 + 0.5}) {};
+  \node[qfdrel/W] at ({14 - 0.5}, {-10 + 0.5}) {};
+
+  % W11 row 11: H13S
+  \node[qfdrel/S] at ({13 - 0.5}, {-11 + 0.5}) {};
+
+  % W12 row 12: H6W H8M
+  \node[qfdrel/W] at ({6 - 0.5},  {-12 + 0.5}) {};
+  \node[qfdrel/M] at ({8 - 0.5},  {-12 + 0.5}) {};
+
+  % W13 row 13: H9M
+  \node[qfdrel/M] at ({9 - 0.5},  {-13 + 0.5}) {};
+
+  % W14 row 14: H4W H8M H12M H13S
+  \node[qfdrel/W] at ({4 - 0.5},  {-14 + 0.5}) {};
+  \node[qfdrel/M] at ({8 - 0.5},  {-14 + 0.5}) {};
+  \node[qfdrel/M] at ({12 - 0.5}, {-14 + 0.5}) {};
+  \node[qfdrel/S] at ({13 - 0.5}, {-14 + 0.5}) {};
+
+  % ---------- Roof correlations ----------
+  \node[font=\scriptsize] at (C-1-2)   {$+\!+$};   % H1-H2 strong reinforce
+  \node[font=\scriptsize] at (C-1-3)   {$-$};      % H1-H3 mild conflict
+  \node[font=\scriptsize] at (C-1-5)   {$+$};      % H1-H5 mild reinforce
+  \node[font=\scriptsize] at (C-1-13)  {$-$};      % H1-H13 mild conflict
+  \node[font=\scriptsize] at (C-2-3)   {$+\!+$};   % H2-H3 strong reinforce
+  \node[font=\scriptsize] at (C-2-13)  {$+$};      % H2-H13
+  \node[font=\scriptsize] at (C-3-13)  {$+$};      % H3-H13
+  \node[font=\scriptsize] at (C-4-10)  {$-$};      % H4-H10 boot vs binary
+  \node[font=\scriptsize] at (C-5-6)   {$+$};      % H5-H6
+  \node[font=\scriptsize] at (C-5-8)   {$+$};      % H5-H8
+  \node[font=\scriptsize] at (C-5-9)   {$-\!-$};   % H5-H9 soak vs heap
+  \node[font=\scriptsize] at (C-6-7)   {$+$};      % H6-H7
+  \node[font=\scriptsize] at (C-6-9)   {$-\!-$};   % H6-H9 push vs heap
+  \node[font=\scriptsize] at (C-6-12)  {$+\!+$};   % H6-H12
+  \node[font=\scriptsize] at (C-7-9)   {$-$};      % H7-H9
+  \node[font=\scriptsize] at (C-7-12)  {$+\!+$};   % H7-H12
+  \node[font=\scriptsize] at (C-9-10)  {$-\!-$};   % H9-H10 heap vs binary
+  \node[font=\scriptsize] at (C-10-14) {$-\!-$};   % H10-H15 binary vs build
+  \node[font=\scriptsize] at (C-11-13) {$-$};      % H11-H13
+
+  % ---------- Basement: target / abs weight / rel weight % ----------
+  \foreach \c/\tgt/\abs/\rel in {%
+    1/{$\leq$200\,ms}/148/10,
+    2/{$\leq$1 line}/177/11,
+    3/{1 : 64}/144/9,
+    4/{$\leq$5\,s}/62/4,
+    5/{$\geq$1\,h}/111/7,
+    6/{$\geq$95\,\%}/134/9,
+    7/{$\leq$30\,s}/27/2,
+    8/{100\,\%}/156/10,
+    9/{$\geq$1\,MB}/193/12,
+    10/{$\leq$2\,MB}/41/3,
+    11/{$\leq$80\,KB}/45/3,
+    12/{$\leq$30\,s}/153/10,
+    13/{obs.}/137/9,
+    14/{$\leq$7\,min}/29/2%
+  } {
+    \node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 0.5}) {\tgt};
+    \node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 1.5}) {\abs};
+    \node[font=\scriptsize\bfseries]
+      at ({\c - 0.5}, {-\qfdNW - 2.5}) {\rel};
+  }
+
+  % ---------- Basement row labels (in the margin below WHATs) ----------
+  \foreach \k/\lbl in {1/{Target (v0.1)}, 2/{$\Sigma$ abs}, 3/{Rel.\ \%}}
+    \node[anchor=east, font=\scriptsize\itshape]
+      at ({-0.1}, {-\qfdNW - \k + 0.5}) {\lbl};
+
+  % ---------- Perception zone: 5 products x 14 WHATs (0-5 scores) ----------
+  % Columns: \so=Typoena target, \st=reMarkable 2 + Type Folio,
+  %          \sf=Freewrite Traveler, \sg=Pomera DM250,
+  %          \sh=Freewrite Smart Typewriter.
+  % Pass 1: stash each score as a named coordinate so the profile lines
+  % below can reuse it without recomputing.
+  \foreach \r/\so/\st/\sf/\sg/\sh in {%
+    1/4/1/4/5/3,
+    2/5/4/4/2/4,
+    3/4/4/2/2/2,
+    4/5/2/2/5/2,
+    5/4/3/4/5/4,
+    6/3/3/4/5/4,
+    7/5/2/5/5/5,
+    8/4/3/4/5/4,
+    9/4/3/2/1/2,
+    10/5/4/2/1/2,
+    11/1/5/5/4/5,
+    12/3/1/2/3/2,
+    13/3/5/2/2/2,
+    14/2/4/5/2/5%
+  } {
+    \pgfmathsetmacro{\xo}{\qfdNH + (\so + 0.5)*\qfdCmpW/6}
+    \pgfmathsetmacro{\xt}{\qfdNH + (\st + 0.5)*\qfdCmpW/6}
+    \pgfmathsetmacro{\xf}{\qfdNH + (\sf + 0.5)*\qfdCmpW/6}
+    \pgfmathsetmacro{\xg}{\qfdNH + (\sg + 0.5)*\qfdCmpW/6}
+    \pgfmathsetmacro{\xs}{\qfdNH + (\sh + 0.5)*\qfdCmpW/6}
+    \coordinate (po-\r) at (\xo, {-\r + 0.5});
+    \coordinate (pr-\r) at (\xt, {-\r + 0.5});
+    \coordinate (pf-\r) at (\xf, {-\r + 0.5});
+    \coordinate (pp-\r) at (\xg, {-\r + 0.5});
+    \coordinate (ps-\r) at (\xs, {-\r + 0.5});
+  }
+
+  % Pass 2: profile lines per alternative. Drawn before markers so the
+  % dots sit on top of (not under) the line endpoints.
+  \draw[qfdalt1ln] (po-1) \foreach \r in {2,...,\qfdNW} { -- (po-\r) };
+  \draw[qfdalt2ln] (pr-1) \foreach \r in {2,...,\qfdNW} { -- (pr-\r) };
+  \draw[qfdalt3ln] (pf-1) \foreach \r in {2,...,\qfdNW} { -- (pf-\r) };
+  \draw[qfdalt4ln] (pp-1) \foreach \r in {2,...,\qfdNW} { -- (pp-\r) };
+  \draw[qfdalt5ln] (ps-1) \foreach \r in {2,...,\qfdNW} { -- (ps-\r) };
+
+  % Pass 3: markers on top of the lines.
+  \foreach \r in {1,...,\qfdNW} {
+    \node[qfdalt1mk] at (po-\r) {};
+    \node[qfdalt2mk] at (pr-\r) {};
+    \node[qfdalt3mk] at (pf-\r) {};
+    \node[qfdalt4mk] at (pp-\r) {};
+    \node[qfdalt5mk] at (ps-\r) {};
+  }
+
+  % ---------- Manual legend (5 alternatives, placed right of zones) ----------
+  \pgfmathsetmacro{\qfdLegX}{\qfdNH + \qfdCmpW + 0.7}
+  \begin{scope}[shift={(\qfdLegX, \qfdHdrH - 0.4)}]
+    \draw[qfdmed, rounded corners=2pt]
+      (-0.15, 0.4) rectangle (5.1, -7.50);
+    % Relations
+    \node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
+      {Relation};
+    \draw[qfdthin] (0, -0.15) -- (4.95, -0.15);
+    \node[qfdstrong] at (0.22, -0.5)  {};
+      \node[anchor=west] at (0.5, -0.5)  {Strong (9)};
+    \node[qfdmod]    at (0.22, -0.95) {};
+      \node[anchor=west] at (0.5, -0.95) {Medium (3)};
+    \node[qfdweak]   at (0.22, -1.4)  {};
+      \node[anchor=west] at (0.5, -1.4)  {Weak (1)};
+    % Correlation
+    \node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
+      {Correlation};
+    \draw[qfdthin] (0, -2.35) -- (4.95, -2.35);
+    \node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
+    \node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
+    \node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
+    \node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
+    % Perception
+    \node[anchor=west, font=\footnotesize\bfseries] at (0, -4.20)
+      {Perception};
+    \draw[qfdthin] (0, -4.45) -- (4.95, -4.45);
+    \draw[qfdalt1ln] (0.05, -4.80) -- (0.45, -4.80);
+      \node[qfdalt1mk] at (0.25, -4.80) {};
+      \node[anchor=west, font=\bfseries] at (0.55, -4.80)
+        {Typoena (v0.1 target)};
+    \draw[qfdalt2ln] (0.05, -5.25) -- (0.45, -5.25);
+      \node[qfdalt2mk] at (0.25, -5.25) {};
+      \node[anchor=west] at (0.55, -5.25) {reMarkable 2 + Type Folio};
+    \draw[qfdalt3ln] (0.05, -5.70) -- (0.45, -5.70);
+      \node[qfdalt3mk] at (0.25, -5.70) {};
+      \node[anchor=west] at (0.55, -5.70) {Freewrite Traveler};
+    \draw[qfdalt5ln] (0.05, -6.15) -- (0.45, -6.15);
+      \node[qfdalt5mk] at (0.25, -6.15) {};
+      \node[anchor=west] at (0.55, -6.15) {Freewrite Smart Typewriter};
+    \draw[qfdalt4ln] (0.05, -6.60) -- (0.45, -6.60);
+      \node[qfdalt4mk] at (0.25, -6.60) {};
+      \node[anchor=west] at (0.55, -6.60) {Pomera DM250};
+    \node[anchor=west, font=\scriptsize\itshape] at (0, -7.15)
+      {0 = poor, 5 = excellent};
+  \end{scope}
+
+\end{qfdhouse}
+\end{document}
+```
+
+### Reading the house
+
+- **Importance (left column)** is the raw 1–10 weight from §1, not a normalised
+  %, so adding stays cheap when a WHAT shifts. Sum of weights is 103; treat each
+  unit as ~0.97 % if you want a percentage view.
+- **Roof** carries the §4 symbols translated into classical QFD glyphs:
+  `++` strong reinforcement (`◎`), `+` mild reinforcement (`○`), `−` mild
+  conflict (`×`), `−−` strong conflict (`⊗`).
+- **Basement rows** are: v0.1 target → column sum (`Σ` of `weight × strength`) →
+  relative weight as integer % of total (1557). Relative weights round to 100.
+- **H7, H10, H15** (Publish latency, binary size, build time) sit at the bottom
+  of the basement — knowingly-paid costs per §7, not signals to optimise harder.
 
 ### Top engineering priorities (from importance)
 
@@ -160,6 +730,98 @@ user preference for faster iteration, not matrix-derived priority; if it
 pushes back against [ADR-001]'s "+5–10 min" pricing, the target moves
 before the runtime decision does.
 
+### Perception scores (guessed)
+
+Five products on the 0–5 scale, scored against each WHAT. Reference
+configurations: **reMarkable 2 + Type Folio**, **Freewrite Traveler**,
+**Freewrite Smart Typewriter**, **Pomera DM250** (DM250 has a reflective
+monochrome LCD, not e-ink — flagged in W1 / W8). "Typoena" is the v0.1
+target from §2, not measured yet.
+
+Freewrite Traveler scores assume the
+[Sailfish firmware](https://getfreewrite.com/blogs/writing-success/freewrite-sailfish-firmware)
+(released 2025-11-19), which rewrote the OS in Rust, cut keystroke latency
+40–100 %, and trimmed power draw −30 % typing / −50 % idle on both
+Traveler and Smart Typewriter Gen 3. Three rows rescored upward as a
+result: W1 Traveler 3→4 / Smart 2→3 (Smart's larger panel still trails
+Traveler by one notch), W5 both 3→4 (boot accelerated, no published
+number), W9 both 1→2 (Rust rewrite explicitly unblocked features that
+JS could not carry; still closed so neither reaches reMarkable's
+hackable-Linux 3).
+
+| ID  | WHAT (truncated)                                  | Typoena | reM. | Frw.T | Frw.S | Pom. | Rationale (shortest defensible)                                                                                                                                                                                                                                            |
+| --- | ------------------------------------------------- | :-----: | :--: | :---: | :---: | :--: | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| W1  | Sub-second response to typing                     |    4    |  1   |   4   |   3   |  5   | Typoena targets ≤200 ms; reMarkable e-ink visibly laggy on a typing-focused device — tested less responsive than Smart Typewriter, and latency is so load-bearing for W1 that it earns a 1 not a 2; both Freewrites post-Sailfish trimmed latency 40–100 % (Frw.T plausibly inside 200 ms; Frw.S still trails by one notch on larger panel); Pomera LCD ~zero. |
+| W2  | Publishing is one deliberate action away          |    5    |  4   |   4   |   4   |  2   | Ctrl-G atomic; reMarkable + Freewrite cloud-sync is one-tap but not git; Pomera = USB/SD copy or QR transfer.                                                                                                                                                              |
+| W3  | Pulling power never corrupts the file             |    4    |  4   |   2   |   2   |  2   | Typoena: atomic-rename + fsync. reMarkable journals. Freewrite + Pomera: forum reports of corruption on yank.                                                                                                                                                              |
+| W4  | Provisioning never interrupts writing             |    5    |  2   |   2   |   2   |  5   | Typoena v0.1: build-time config (dev-only). reM/Frw need Wi-Fi + account. Pomera: literally none.                                                                                                                                                                          |
+| W5  | Quick boot to a writing cursor                    |    4    |  3   |   4   |   4   |  5   | Typoena target ≤5 s. reMarkable cold-boots ~20 s (great from sleep). Both Freewrites accelerated post-Sailfish (no published number; were ~10–15 s e-ink wake). Pomera ~3 s.                                                                                               |
+| W6  | Long sessions without crash / lag / drift         |    3    |  3   |   4   |   4   |  5   | Typoena unproven (1 h target). Freewrite famously stable (both variants). Pomera firmware is decades-mature.                                                                                                                                                               |
+| W7  | Nothing on the device competes with prose         |    5    |  2   |   5   |   5   |  5   | reMarkable has apps, menus, drawing, PDFs. Freewrite + Pomera are single-purpose; Typoena by design.                                                                                                                                                                       |
+| W8  | The UI never moves except when I move it          |    4    |  3   |   4   |   4   |  5   | reMarkable animates more; Typoena uses dirty-rects; Freewrites minimal motion; Pomera near-static LCD.                                                                                                                                                                     |
+| W9  | Codebase absorbs the planned roadmap              |    4    |  3   |   2   |   2   |  1   | Modular Rust Typoena; reMarkable is hackable Linux; both Freewrites carry Sailfish (Rust rewrite explicitly unblocked features JS could not carry) but closed; Pomera closed firmware.                                                                                     |
+| W10 | I can repair or fork it with hobbyist tools       |    5    |  4   |   2   |   2   |  1   | Typoena: open BOM + ESP32. reMarkable: rooted Linux + community ROMs. Freewrite + Pomera: closed.                                                                                                                                                                          |
+| W11 | Multi-day battery life (v0.8 onward)              |    1    |  5   |   5   |   5   |  4   | Typoena v0.1 = wall-powered (battery deferred). reMarkable + both Freewrites legendary (~4 weeks; Sailfish trimmed −30 % typing / −50 % idle). Pomera ~24 h.                                                                                                               |
+| W12 | Local-only files coexist with git scope           |    3    |  1   |   2   |   2   |  3   | Typoena v0.5+ design. reMarkable cloud-only. Freewrites have local + Postbox but no VCS. Pomera = pure local.                                                                                                                                                              |
+| W13 | Typography sets a writing-tool tone               |    3    |  5   |   2   |   2   |  2   | Typoena v0.1: single mono (serif option in v1.0). reMarkable: rich type rendering. Freewrite + Pomera: utilitarian.                                                                                                                                                        |
+| W14 | I can carry the device and write away from a desk |    2    |  4   |   5   |   1   |  5   | Typoena v0.1 wall-powered (ADR-008), no enclosure spec yet — desk-bound by design. reMarkable + Type Folio bag-friendly with bulk. Freewrite Traveler is the form-factor reference (~1.6 lb, folds). Smart Typewriter ~5 lb, desk-bound. Pomera DM250 pocketable foldable. |
+
+**Totals** (sum across 14 WHATs, no weighting): Typoena 52, Pomera 50,
+Freewrite Traveler 47, reMarkable 44, Freewrite Smart Typewriter 42
+(Traveler pre-Sailfish 44; Smart pre-Sailfish 39; reMarkable W1 dropped
+3→2→1 across two rounds of author testing — first to 2 after firsthand
+typing, then to 1 once latency was recognised as the dominant W1
+signal). Pomera closing to within 2 of
+Typoena is W14 doing what W14 should — surfacing the dimension on
+which v0.1's tethered MVP loses ground that v0.8 is expected to
+recover. The "Pomera + Wi-Fi + git + hackable BOM" framing from
+`README.md` still holds and reads stronger.
+
+Weighted totals (Σ score × W weight) tell the same story with more
+contrast — left as exercise; the unweighted view is enough to read the
+picture.
+
+#### Caveats
+
+- **Single-rater bias.** All thirteen rows are scored from the project
+  author's POV. A reMarkable buyer would weight W11 (battery) at 10 and
+  W12 (git) at 1, flipping the totals.
+- **Configuration matters.** Freewrite Smart Typewriter and Traveler are
+  both tracked; they diverge most on W1 / W5 because of display tech
+  (Smart's larger panel is slower to refresh). Traveler is still the
+  more direct competitor on form factor.
+- **W3 / W6 Freewrite scores are anecdotal.** Forum reports, not bench
+  data. Treat the 2 / 4 as "we'd need to test this" rather than fact.
+- **No price column.** Typoena-as-BOM is materially cheaper than the
+  competitors but cost is not a WHAT in §1, so it's absent here.
+  Worth a row if a v0.x WHAT ever calls it out.
+
+### Regenerating
+
+The matrix cells (`\node[qfdrel/{S,M,W}]`), roof symbols (`C-i-j` slots),
+and basement Σ + Rel% are native to this file — re-score directly in the
+TikZ source, then update the §3 priority list and §4 conflict list in
+the narrative above to match the new picture.
+
+When §1 or §2 changes:
+
+1. Importance column → §1 weight column.
+2. HOW titles + v0.1 targets → §2 target column.
+3. Recompute basement Σ for any HOW whose column changed: per-cell
+   contribution = `(W weight) × (cell strength: 9 / 3 / 1 / 0)`.
+4. Recompute relative weight: each Σ ÷ total Σ × 100, rounded to integer
+   percent.
+
+Perception scores are **not** derived from §1/§2 — they live only in
+this file. Update them when (a) a competitor ships a relevant change,
+(b) measurement replaces a guess, or (c) a WHAT is added/removed in §1.
+Each score keeps its one-line rationale in the table above.
+
+If a renderer rejects the `tikz` fence, the file is still readable as
+source — the placement comments name each WHAT, HOW, and cell. The
+perception-scores table above is the human-readable fallback for the
+right-hand zone of the diagram.
+
 ---
 
 ## 4. Roof — HOW-vs-HOW tradeoffs
@@ -167,9 +829,9 @@ before the runtime decision does.
 The roof shows where pushing one characteristic pushes another the wrong way.
 ASCII glyphs (with classical QFD equivalents): **`++`** strong
 reinforcement (`◎`), **`+`** mild reinforcement (`○`), **`−`** mild
-conflict (`×`), **`−−`** strong conflict (`⊗`). The 14×14 roof matrix
-lives in [`quality-house.md`](quality-house.md); the cells that
-actually shape the design are called out below.
+conflict (`×`), **`−−`** strong conflict (`⊗`). The 14×14 roof matrix is
+in the §3 diagram; the cells that actually shape the design are called out
+below.
 
 ### Conflicts that actually shape the design
 
@@ -437,8 +1099,8 @@ These are the live tensions we are watching, not deciding harder:
   honest reading that "codebase absorbs the planned roadmap" is
   delivered by ADRs, not by a measurable characteristic. ID "H14" left
   as a gap (cross-doc HOW references survive without renumbering H15).
-  Total basement Σ drops 1674 → 1557, so rel% recomputed in
-  [`quality-house.md`](quality-house.md).
+  Total basement Σ drops 1674 → 1557, so rel% recomputed in the §3
+  basement.
 - **HOWs renamed "characteristics," not "functions."** A function is a
   transformation (input → output); HOWs like H6 "success rate" and
   H10 "binary size" are *measures* of functions or properties of
@@ -516,8 +1178,8 @@ README, the product/technical docs, and [ADR-003] are all updated to ~13 lines
   reality drifts from estimates.
 - The WHATs (§1) change rarely; the HOWs (§2) change with each release.
   When either changes, re-score the matrix and recompute the basement Σ
-  in [`quality-house.md`](quality-house.md); then check the §3 priority
-  list and §4 conflict list here still match the new picture.
+  in the §3 diagram; then check the §3 priority list and §4 conflict list
+  here still match the new picture.
 
 [ADR-001]: adr.md#adr-001-language-and-runtime--rust-on-esp-idf-rs-std
 [ADR-002]: adr.md#adr-002-ui-strategy--custom-widgets-on-embedded-graphics-not-ratatui
diff --git a/docs/quality-house-empty.md b/docs/quality-house-empty.md
index 1c234fe..de0f396 100644
--- a/docs/quality-house-empty.md
+++ b/docs/quality-house-empty.md
@@ -1,9 +1,9 @@
 # Quality House — empty (training)
 
-Same 14 WHATs × 14 HOWs chassis as [`quality-house.md`](quality-house.md),
-with the **relations**, **roof correlations**, and basement Σ / Rel %
-**deliberately blank**. Fill them in yourself, then compare against the
-populated house to check your reading.
+Same 14 WHATs × 14 HOWs chassis as the filled House in
+[`qfd.md` §3](qfd.md#3-house-of-quality--whats--hows), with the **relations**,
+**roof correlations**, and basement Σ / Rel % **deliberately blank**. Fill them
+in yourself, then compare against the populated house to check your reading.
 
 Kept (definitional inputs from `qfd.md`):
 
@@ -368,9 +368,10 @@ Blank (training surface):
 4. **Basement Rel %.** Each Σ ÷ total Σ × 100, rounded to integer percent
    (should sum to ~100 across HOWs).
 
-Once filled, diff your numbers against [`quality-house.md`](quality-house.md)
-basement and roof to see where your reading agrees or differs — divergences
-are usually the most interesting part.
+Once filled, diff your numbers against the filled House in
+[`qfd.md` §3](qfd.md#3-house-of-quality--whats--hows) (basement and roof) to see
+where your reading agrees or differs — divergences are usually the most
+interesting part.
 
 ## Gotchas
 
diff --git a/docs/quality-house.md b/docs/quality-house.md
deleted file mode 100644
index 3381cc1..0000000
--- a/docs/quality-house.md
+++ /dev/null
@@ -1,675 +0,0 @@
-# Quality House
-
-The 14 WHATs × 14 HOWs House of Quality. The roof carries function-vs-
-function correlations; the basement carries v0.1 targets (mirrored from
-[`qfd.md`](qfd.md) §2) plus the weighted-vote sums
-(`Σ = Σ(W weight × cell strength)`) and rounded relative weights. The
-narrative reading of these numbers lives in `qfd.md` §3 (priority list)
-and §4 (conflict list).
-
-This file is the authoritative source for the matrix cells, the roof
-correlations, and the basement Σ + relative weights. WHATs (§1) and HOWs
-(§2) are mirrored here from `qfd.md`; if those diverge, trust `qfd.md`.
-
-Out of scope here: §5 component mapping (would need a second house),
-§6 critical performance budget (already a curated rank), §7 tradeoffs
-(narrative), §8 inconsistencies (history).
-
-For a blank version of the same chassis (WHATs, HOWs, importance, and
-v0.1 targets kept; relations + roof + Σ basement left empty for practice),
-see [`quality-house-empty.md`](quality-house-empty.md).
-
-The perception zone scores five products against the WHATs on a 0–5 scale.
-**These are educated guesses, not measurements** — see the
-[scoring rationale](#perception-scores-guessed) below for what each cell
-is based on. Useful for self-positioning ("where do we land vs the
-market"), not as a fair head-to-head buyer's guide.
-
-```tikz
-% =====================================================================
-% QFD "House of Quality" preamble
-% =====================================================================
-\usetikzlibrary{arrows.meta, positioning, shapes.geometric, shapes.misc, calc, fit, backgrounds}
-
-\newif\ifqfdshowroof          \qfdshowrooftrue
-\newif\ifqfdshowbasement      \qfdshowbasementtrue
-\newif\ifqfdshowcompetitive   \qfdshowcompetitivetrue
-\newif\ifqfdshowlegend        \qfdshowlegendtrue
-\newif\ifqfdshowimportance    \qfdshowimportancetrue
-\newif\ifqfdshowcorrlegend    \qfdshowcorrlegendtrue
-\newif\ifqfdshowevallegend    \qfdshowevallegendtrue
-
-\def\qfdNW{5}
-\def\qfdNH{5}
-\def\qfdWhatW{4.0}
-\def\qfdImpW{0.9}
-\def\qfdCmpW{3}
-\def\qfdHdrH{2.6}
-\def\qfdBasementN{4}
-
-\def\qfdWhatsTitle{Customer needs}
-\def\qfdImpTitle{Imp.\ \%}
-\def\qfdPerceptionTitle{Comparative evaluation}
-\def\qfdPoorLabel{poor}
-\def\qfdExcellentLabel{excellent}
-\def\qfdAltOneLabel{Typoena}
-\def\qfdAltTwoLabel{Competitor A}
-\def\qfdAltThreeLabel{Competitor B}
-\def\qfdRelTitle{Relation}
-\def\qfdCorrTitle{Correlation}
-\def\qfdEvalTitle{Evaluation}
-
-\tikzset{
-  qfdthin/.style ={line width=0.35pt},
-  qfdmed/.style  ={line width=0.7pt},
-  qfdstrong/.style={circle, draw, fill=black,
-                    minimum size=7pt, inner sep=0pt},
-  qfdmod/.style  ={circle, draw,
-                    minimum size=7pt, inner sep=0pt, line width=0.8pt},
-  qfdweak/.style ={regular polygon, regular polygon sides=3, draw,
-                    minimum size=8.5pt, inner sep=0pt, line width=0.7pt},
-  qfdrel/.is choice,
-  qfdrel/S/.style={qfdstrong},
-  qfdrel/M/.style={qfdmod},
-  qfdrel/W/.style={qfdweak},
-  qfdalt1mk/.style={circle, draw, fill=black,
-                    minimum size=6pt, inner sep=0pt, line width=1pt},
-  qfdalt1ln/.style={line width=1.2pt},
-  qfdalt2mk/.style={regular polygon, regular polygon sides=3, draw,
-                    fill=black, minimum size=6pt, inner sep=0pt,
-                    line width=0.7pt},
-  qfdalt2ln/.style={line width=0.7pt, dashed},
-  qfdalt3mk/.style={rectangle, draw, fill=black,
-                    minimum size=5pt, inner sep=0pt, line width=0.7pt},
-  qfdalt3ln/.style={line width=0.7pt, dotted},
-}
-
-\newcommand{\qfdDrawGrid}{%
-  \foreach \c in {1,...,\qfdNHm} \draw[qfdthin] (\c, 0) -- (\c, -\qfdNW);
-  \foreach \r in {1,...,\qfdNWm} \draw[qfdthin] (0, -\r) -- (\qfdNH, -\r);
-  \foreach \r in {1,...,\qfdNWm}
-    \draw[qfdthin] (\qfdLeftEdge, -\r) -- (0, -\r);
-  \ifqfdshowroof
-    \foreach \c in {1,...,\qfdNHm}
-      \draw[qfdthin] (\c, 0) -- (\c, \qfdHdrH);
-  \fi
-  \ifqfdshowcompetitive
-    \foreach \r in {1,...,\qfdNWm}
-      \draw[qfdthin] (\qfdNH, -\r) -- (\qfdNH+\qfdCmpW, -\r);
-  \fi
-  \ifqfdshowbasement
-    \foreach \r in {1,...,\qfdBasementN}
-      \draw[qfdthin] (0, -\qfdNW-\r) -- (\qfdNH, -\qfdNW-\r);
-    \foreach \c in {1,...,\qfdNHm}
-      \draw[qfdthin] (\c, -\qfdNW) -- (\c, -\qfdNW-\qfdBasementN);
-  \fi
-}
-
-\newcommand{\qfdDrawRoof}{%
-  \ifqfdshowroof
-    \foreach \k in {1,...,\qfdNHm} {%
-      \pgfmathsetmacro{\rx}{(\k+\qfdNH)/2}
-      \pgfmathsetmacro{\ry}{\qfdHdrH + (\qfdNH-\k)/2}
-      \pgfmathsetmacro{\lx}{\k/2}
-      \pgfmathsetmacro{\ly}{\qfdHdrH + \k/2}
-      \draw[qfdthin] (\k, \qfdHdrH) -- (\rx, \ry);
-      \draw[qfdthin] (\k, \qfdHdrH) -- (\lx, \ly);
-    }%
-    \draw[qfdmed] (0, \qfdHdrH)
-       -- (\qfdNH/2, \qfdApexY) -- (\qfdNH, \qfdHdrH);
-    \foreach \i in {1,...,\qfdNH}
-      \foreach \k in {1,...,\qfdNH} {%
-        \pgfmathtruncatemacro{\jj}{\i+\k}
-        \ifnum\jj>\qfdNH\relax\else
-          \pgfmathsetmacro{\xx}{\i + \k/2 - 0.5}
-          \pgfmathsetmacro{\yy}{\qfdHdrH + \k/2}
-          \coordinate (C-\i-\jj) at (\xx, \yy);
-        \fi
-      }%
-  \fi
-}
-
-\newcommand{\qfdDrawScale}{%
-  \ifqfdshowcompetitive
-    \foreach \tk in {0,1,2,3,4,5} {%
-      \pgfmathsetmacro{\tx}{\qfdNH + (\tk+0.5)*\qfdCmpW/6}
-      \node[anchor=south, font=\scriptsize] at (\tx, 0.02) {\tk};
-    }%
-    \node[anchor=south, font=\scriptsize\bfseries, align=center,
-          text width=\qfdCmpW cm]
-         at ({\qfdNH + \qfdCmpW/2}, 0.7) {\qfdPerceptionTitle};
-    \node[anchor=north, font=\scriptsize\itshape]
-         at ({\qfdNH + 0.45}, -\qfdNW) {\qfdPoorLabel};
-    \node[anchor=north, font=\scriptsize\itshape]
-         at ({\qfdNH + \qfdCmpW - 0.45}, -\qfdNW) {\qfdExcellentLabel};
-  \fi
-}
-
-\newcommand{\qfdDrawZoneTitles}{%
-  \ifqfdshowimportance
-    \node[rotate=90, anchor=west, font=\footnotesize\bfseries]
-         at ({-\qfdImpW/2}, 0.12) {\qfdImpTitle};
-  \fi
-  \node[font=\scriptsize\bfseries, align=center, text width=\qfdWhatW cm]
-       at ({\qfdLeftEdge + \qfdWhatW/2},
-           {\ifqfdshowroof \qfdHdrH/2 \else 0.6 \fi}) {\qfdWhatsTitle};
-}
-
-\newcommand{\qfdDrawFrames}{%
-  \begin{scope}[qfdmed]
-    \draw (\qfdLeftEdge, 0) rectangle (\qfdNH, -\qfdNW);
-    \ifqfdshowimportance \draw (-\qfdImpW, 0) -- (-\qfdImpW, -\qfdNW); \fi
-    \draw (0, 0) -- (0, -\qfdNW);
-    \ifqfdshowroof
-      \draw (0, 0) rectangle (\qfdNH, \qfdHdrH); \fi
-    \ifqfdshowbasement
-      \draw (0, -\qfdNW) rectangle (\qfdNH, -\qfdNW-\qfdBasementN); \fi
-    \ifqfdshowcompetitive
-      \draw (\qfdNH, 0) rectangle (\qfdNH+\qfdCmpW, -\qfdNW); \fi
-  \end{scope}
-}
-
-\newcommand{\qfdDrawLegend}{%
-  \ifqfdshowlegend
-    \pgfmathsetmacro{\qfdLegX}{%
-      \qfdNH + \ifqfdshowcompetitive \qfdCmpW + 0.7 \else 0.7 \fi}
-    \pgfmathsetmacro{\qfdLegBottom}{%
-      -2.05
-      \ifqfdshowroof    \ifqfdshowcorrlegend - 2.55 \fi \fi
-      \ifqfdshowcompetitive \ifqfdshowevallegend - 2.20 \fi \fi}
-    \pgfmathsetmacro{\qfdLegY}{\qfdHdrH - 0.4}
-    \begin{scope}[shift={(\qfdLegX, \qfdLegY)}]
-      \draw[qfdmed, rounded corners=2pt]
-        (-0.15, 0.4) rectangle (4.5, \qfdLegBottom);
-      \node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
-        {\qfdRelTitle};
-      \draw[qfdthin] (0, -0.15) -- (4.35, -0.15);
-      \node[qfdstrong] at (0.22, -0.5)  {};
-        \node[anchor=west] at (0.5, -0.5)  {Strong (9)};
-      \node[qfdmod]    at (0.22, -0.95) {};
-        \node[anchor=west] at (0.5, -0.95) {Medium (3)};
-      \node[qfdweak]   at (0.22, -1.4)  {};
-        \node[anchor=west] at (0.5, -1.4)  {Weak (1)};
-      \ifqfdshowroof \ifqfdshowcorrlegend
-        \node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
-          {\qfdCorrTitle};
-        \draw[qfdthin] (0, -2.35) -- (4.35, -2.35);
-        \node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
-        \node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
-        \node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
-        \node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
-      \fi \fi
-      \ifqfdshowcompetitive \ifqfdshowevallegend
-        \pgfmathsetmacro{\qfdEvalTop}{%
-          -2.10 \ifqfdshowroof\ifqfdshowcorrlegend - 2.55 \fi\fi}
-        \node[anchor=west, font=\footnotesize\bfseries]
-          at (0, \qfdEvalTop) {\qfdEvalTitle};
-        \pgfmathsetmacro{\qfdEvalSep}{\qfdEvalTop - 0.25}
-        \draw[qfdthin] (0, \qfdEvalSep) -- (4.35, \qfdEvalSep);
-        \pgfmathsetmacro{\qfdLegA}{\qfdEvalTop - 0.55}
-        \draw[qfdalt1ln] (0.05, \qfdLegA) -- (0.45, \qfdLegA);
-          \node[qfdalt1mk] at (0.25, \qfdLegA) {};
-          \node[anchor=west, font=\bfseries] at (0.55, \qfdLegA)
-            {\qfdAltOneLabel};
-        \pgfmathsetmacro{\qfdLegB}{\qfdEvalTop - 0.95}
-        \draw[qfdalt2ln] (0.05, \qfdLegB) -- (0.45, \qfdLegB);
-          \node[qfdalt2mk] at (0.25, \qfdLegB) {};
-          \node[anchor=west] at (0.55, \qfdLegB) {\qfdAltTwoLabel};
-        \pgfmathsetmacro{\qfdLegC}{\qfdEvalTop - 1.35}
-        \draw[qfdalt3ln] (0.05, \qfdLegC) -- (0.45, \qfdLegC);
-          \node[qfdalt3mk] at (0.25, \qfdLegC) {};
-          \node[anchor=west] at (0.55, \qfdLegC) {\qfdAltThreeLabel};
-      \fi \fi
-    \end{scope}
-  \fi
-}
-
-\newenvironment{qfdhouse}{%
-  \begin{tikzpicture}[x=1cm, y=1cm, font=\scriptsize,
-                      line cap=round, line join=round]
-  \ifqfdshowimportance
-    \pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW-\qfdImpW}
-  \else
-    \pgfmathsetmacro{\qfdLeftEdge}{-\qfdWhatW}
-  \fi
-  \pgfmathsetmacro{\qfdApexY}{\qfdHdrH + \qfdNH/2}
-  \pgfmathtruncatemacro{\qfdNHm}{\qfdNH - 1}
-  \pgfmathtruncatemacro{\qfdNWm}{\qfdNW - 1}
-  \qfdDrawGrid
-  \qfdDrawRoof
-  \qfdDrawScale
-  \qfdDrawZoneTitles
-}{%
-  \qfdDrawFrames
-  \qfdDrawLegend
-  \end{tikzpicture}%
-}
-
-% --- Dimensions tuned for the typewriter QFD (14 W x 15 H) ---
-\def\qfdNW{14}
-\def\qfdNH{14}
-\def\qfdWhatW{4.6}
-\def\qfdImpW{0.7}
-\def\qfdHdrH{5.0}
-\def\qfdBasementN{3}
-\def\qfdCmpW{3.4}
-\qfdshowlegendfalse                 % we draw a 4-alternative legend manually
-
-\def\qfdWhatsTitle{User-facing requirements (W)}
-\def\qfdImpTitle{Weight}
-\def\qfdPerceptionTitle{Competitive perception\\(0–5, guessed)}
-\def\qfdPoorLabel{poor}
-\def\qfdExcellentLabel{excellent}
-
-% Perception-zone markers: shape + colour-blind-safe colour per product.
-% Palette is Okabe-Ito (blue, vermillion, bluish green, reddish purple).
-% Light fills + saturated outlines keep stacked markers legible.
-\definecolor{qfdcTypoena}{RGB}{0,114,178}
-\definecolor{qfdcRem}{RGB}{213,94,0}
-\definecolor{qfdcFrw}{RGB}{0,158,115}
-\definecolor{qfdcPom}{RGB}{204,121,167}
-\definecolor{qfdcFrwS}{RGB}{86,180,233}
-
-\tikzset{
-  qfdalt1mk/.style={circle, draw=qfdcTypoena, fill=qfdcTypoena!55!white,
-                    minimum size=6.5pt, inner sep=0pt, line width=1.1pt},
-  qfdalt1ln/.style={line width=1.2pt, qfdcTypoena},
-  qfdalt2mk/.style={regular polygon, regular polygon sides=3,
-                    draw=qfdcRem, fill=qfdcRem!55!white,
-                    minimum size=7pt, inner sep=0pt, line width=0.9pt},
-  qfdalt2ln/.style={line width=0.8pt, dashed, qfdcRem},
-  qfdalt3mk/.style={rectangle, draw=qfdcFrw, fill=qfdcFrw!55!white,
-                    minimum size=5.5pt, inner sep=0pt, line width=0.9pt},
-  qfdalt3ln/.style={line width=0.8pt, dotted, qfdcFrw},
-  qfdalt4mk/.style={diamond, aspect=1, draw=qfdcPom,
-                    fill=qfdcPom!50!white,
-                    minimum size=7pt, inner sep=0pt, line width=1.0pt},
-  qfdalt4ln/.style={line width=0.8pt, dash dot, qfdcPom},
-  qfdalt5mk/.style={regular polygon, regular polygon sides=5,
-                    draw=qfdcFrwS, fill=qfdcFrwS!40!white,
-                    minimum size=5.5pt, inner sep=0pt, line width=0.8pt},
-  qfdalt5ln/.style={line width=0.7pt, dash dot dot, qfdcFrwS},
-}
-
-\begin{document}
-\begin{qfdhouse}
-
-  % ---------- WHATs (left column) ----------
-  % Box width is 0.2 cm narrower than the column so labels have 0.1 cm
-  % clearance on each side and don't bleed into the Weight column.
-  \pgfmathsetmacro{\qfdWhatTextW}{\qfdWhatW - 0.2}
-  \foreach \r/\t in {%
-    1/{W1 Sub-second visible response to typing},
-    2/{W2 Publishing is one deliberate action away},
-    3/{W3 Pulling power never corrupts the file},
-    4/{W4 Provisioning never interrupts a writing session},
-    5/{W5 Quick boot to a writing cursor},
-    6/{W6 Long sessions without crash, lag, drift},
-    7/{W7 Nothing on the device competes with prose},
-    8/{W8 The UI never moves except when I move it},
-    9/{W9 Codebase absorbs the planned roadmap},
-    10/{W10 I can repair or fork it with hobbyist tools},
-    11/{W11 Multi-day battery life (v0.8 onward)},
-    12/{W12 Local-only files coexist with git scope (v0.5+)},
-    13/{W13 Typography sets a writing-tool tone},
-    14/{W14 I can carry the device and write away from a desk}%
-  }
-    \node[anchor=west, font=\scriptsize,
-          text width=\qfdWhatTextW cm, align=left]
-      at ({\qfdLeftEdge + 0.1}, {-\r + 0.5}) {\t};
-
-  % ---------- Importance (raw 1-10 weight) ----------
-  \foreach \r/\w in {1/10, 2/9, 3/10, 4/7, 5/6, 6/9, 7/8, 8/7,
-                     9/8, 10/5, 11/4, 12/5, 13/7, 14/8}
-    \node[font=\scriptsize] at ({-\qfdImpW/2}, {-\r + 0.5}) {\w};
-
-  % ---------- HOWs (rotated column titles) ----------
-  \foreach \c/\t in {%
-    1/{H1 Type latency},
-    2/{H2 Refresh area per keystroke},
-    3/{H3 Full-refresh cadence},
-    4/{H4 Boot latency (cold)},
-    5/{H5 Continuous-typing endurance},
-    6/{H6 Publish reliability},
-    7/{H7 Publish latency},
-    8/{H8 Save durability},
-    9/{H9 PSRAM heap headroom},
-    10/{H10 Firmware binary size},
-    11/{H11 Total stack budget},
-    12/{H12 Network reconnect time},
-    13/{H13 Idle / typing / push current},
-    14/{H15 Clean release build time}%
-  }
-    \node[rotate=90, anchor=west, font=\scriptsize]
-      at ({\c - 0.5}, 0.15) {\t};
-
-  % ---------- Relation matrix (S=9, M=3, W=1) ----------
-  % W1 row 1: H1S H2S H3M H5M H9W H11W
-  \node[qfdrel/S] at ({1 - 0.5},  {-1 + 0.5}) {};
-  \node[qfdrel/S] at ({2 - 0.5},  {-1 + 0.5}) {};
-  \node[qfdrel/M] at ({3 - 0.5},  {-1 + 0.5}) {};
-  \node[qfdrel/M] at ({5 - 0.5},  {-1 + 0.5}) {};
-  \node[qfdrel/W] at ({9 - 0.5},  {-1 + 0.5}) {};
-  \node[qfdrel/W] at ({11 - 0.5}, {-1 + 0.5}) {};
-
-  % W2 row 2: H6S H7M H9S H12S
-  \node[qfdrel/S] at ({6 - 0.5},  {-2 + 0.5}) {};
-  \node[qfdrel/M] at ({7 - 0.5},  {-2 + 0.5}) {};
-  \node[qfdrel/S] at ({9 - 0.5},  {-2 + 0.5}) {};
-  \node[qfdrel/S] at ({12 - 0.5}, {-2 + 0.5}) {};
-
-  % W3 row 3: H8S
-  \node[qfdrel/S] at ({8 - 0.5},  {-3 + 0.5}) {};
-
-  % W4 row 4: H6M H12M
-  \node[qfdrel/M] at ({6 - 0.5},  {-4 + 0.5}) {};
-  \node[qfdrel/M] at ({12 - 0.5}, {-4 + 0.5}) {};
-
-  % W5 row 5: H4S H10M
-  \node[qfdrel/S] at ({4 - 0.5},  {-5 + 0.5}) {};
-  \node[qfdrel/M] at ({10 - 0.5}, {-5 + 0.5}) {};
-
-  % W6 row 6: H1M H3M H5S H6M H8M H9S H11M H12M
-  \node[qfdrel/M] at ({1 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/M] at ({3 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/S] at ({5 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/M] at ({6 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/M] at ({8 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/S] at ({9 - 0.5},  {-6 + 0.5}) {};
-  \node[qfdrel/M] at ({11 - 0.5}, {-6 + 0.5}) {};
-  \node[qfdrel/M] at ({12 - 0.5}, {-6 + 0.5}) {};
-
-  % W7 row 7: H1M H2M H3M H13M
-  \node[qfdrel/M] at ({1 - 0.5},  {-7 + 0.5}) {};
-  \node[qfdrel/M] at ({2 - 0.5},  {-7 + 0.5}) {};
-  \node[qfdrel/M] at ({3 - 0.5},  {-7 + 0.5}) {};
-  \node[qfdrel/M] at ({13 - 0.5}, {-7 + 0.5}) {};
-
-  % W8 row 8: H1W H2S H3S
-  \node[qfdrel/W] at ({1 - 0.5},  {-8 + 0.5}) {};
-  \node[qfdrel/S] at ({2 - 0.5},  {-8 + 0.5}) {};
-  \node[qfdrel/S] at ({3 - 0.5},  {-8 + 0.5}) {};
-
-  % W9 row 9: H10W H11W H15M
-  \node[qfdrel/W] at ({10 - 0.5}, {-9 + 0.5}) {};
-  \node[qfdrel/W] at ({11 - 0.5}, {-9 + 0.5}) {};
-  \node[qfdrel/M] at ({14 - 0.5}, {-9 + 0.5}) {};
-
-  % W10 row 10: H10M H13W H15W
-  \node[qfdrel/M] at ({10 - 0.5}, {-10 + 0.5}) {};
-  \node[qfdrel/W] at ({13 - 0.5}, {-10 + 0.5}) {};
-  \node[qfdrel/W] at ({14 - 0.5}, {-10 + 0.5}) {};
-
-  % W11 row 11: H13S
-  \node[qfdrel/S] at ({13 - 0.5}, {-11 + 0.5}) {};
-
-  % W12 row 12: H6W H8M
-  \node[qfdrel/W] at ({6 - 0.5},  {-12 + 0.5}) {};
-  \node[qfdrel/M] at ({8 - 0.5},  {-12 + 0.5}) {};
-
-  % W13 row 13: H9M
-  \node[qfdrel/M] at ({9 - 0.5},  {-13 + 0.5}) {};
-
-  % W14 row 14: H4W H8M H12M H13S
-  \node[qfdrel/W] at ({4 - 0.5},  {-14 + 0.5}) {};
-  \node[qfdrel/M] at ({8 - 0.5},  {-14 + 0.5}) {};
-  \node[qfdrel/M] at ({12 - 0.5}, {-14 + 0.5}) {};
-  \node[qfdrel/S] at ({13 - 0.5}, {-14 + 0.5}) {};
-
-  % ---------- Roof correlations ----------
-  \node[font=\scriptsize] at (C-1-2)   {$+\!+$};   % H1-H2 strong reinforce
-  \node[font=\scriptsize] at (C-1-3)   {$-$};      % H1-H3 mild conflict
-  \node[font=\scriptsize] at (C-1-5)   {$+$};      % H1-H5 mild reinforce
-  \node[font=\scriptsize] at (C-1-13)  {$-$};      % H1-H13 mild conflict
-  \node[font=\scriptsize] at (C-2-3)   {$+\!+$};   % H2-H3 strong reinforce
-  \node[font=\scriptsize] at (C-2-13)  {$+$};      % H2-H13
-  \node[font=\scriptsize] at (C-3-13)  {$+$};      % H3-H13
-  \node[font=\scriptsize] at (C-4-10)  {$-$};      % H4-H10 boot vs binary
-  \node[font=\scriptsize] at (C-5-6)   {$+$};      % H5-H6
-  \node[font=\scriptsize] at (C-5-8)   {$+$};      % H5-H8
-  \node[font=\scriptsize] at (C-5-9)   {$-\!-$};   % H5-H9 soak vs heap
-  \node[font=\scriptsize] at (C-6-7)   {$+$};      % H6-H7
-  \node[font=\scriptsize] at (C-6-9)   {$-\!-$};   % H6-H9 push vs heap
-  \node[font=\scriptsize] at (C-6-12)  {$+\!+$};   % H6-H12
-  \node[font=\scriptsize] at (C-7-9)   {$-$};      % H7-H9
-  \node[font=\scriptsize] at (C-7-12)  {$+\!+$};   % H7-H12
-  \node[font=\scriptsize] at (C-9-10)  {$-\!-$};   % H9-H10 heap vs binary
-  \node[font=\scriptsize] at (C-10-14) {$-\!-$};   % H10-H15 binary vs build
-  \node[font=\scriptsize] at (C-11-13) {$-$};      % H11-H13
-
-  % ---------- Basement: target / abs weight / rel weight % ----------
-  \foreach \c/\tgt/\abs/\rel in {%
-    1/{$\leq$200\,ms}/148/10,
-    2/{$\leq$1 line}/177/11,
-    3/{1 : 64}/144/9,
-    4/{$\leq$5\,s}/62/4,
-    5/{$\geq$1\,h}/111/7,
-    6/{$\geq$95\,\%}/134/9,
-    7/{$\leq$30\,s}/27/2,
-    8/{100\,\%}/156/10,
-    9/{$\geq$1\,MB}/193/12,
-    10/{$\leq$2\,MB}/41/3,
-    11/{$\leq$80\,KB}/45/3,
-    12/{$\leq$30\,s}/153/10,
-    13/{obs.}/137/9,
-    14/{$\leq$7\,min}/29/2%
-  } {
-    \node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 0.5}) {\tgt};
-    \node[font=\scriptsize] at ({\c - 0.5}, {-\qfdNW - 1.5}) {\abs};
-    \node[font=\scriptsize\bfseries]
-      at ({\c - 0.5}, {-\qfdNW - 2.5}) {\rel};
-  }
-
-  % ---------- Basement row labels (in the margin below WHATs) ----------
-  \foreach \k/\lbl in {1/{Target (v0.1)}, 2/{$\Sigma$ abs}, 3/{Rel.\ \%}}
-    \node[anchor=east, font=\scriptsize\itshape]
-      at ({-0.1}, {-\qfdNW - \k + 0.5}) {\lbl};
-
-  % ---------- Perception zone: 5 products x 14 WHATs (0-5 scores) ----------
-  % Columns: \so=Typoena target, \st=reMarkable 2 + Type Folio,
-  %          \sf=Freewrite Traveler, \sg=Pomera DM250,
-  %          \sh=Freewrite Smart Typewriter.
-  % Pass 1: stash each score as a named coordinate so the profile lines
-  % below can reuse it without recomputing.
-  \foreach \r/\so/\st/\sf/\sg/\sh in {%
-    1/4/1/4/5/3,
-    2/5/4/4/2/4,
-    3/4/4/2/2/2,
-    4/5/2/2/5/2,
-    5/4/3/4/5/4,
-    6/3/3/4/5/4,
-    7/5/2/5/5/5,
-    8/4/3/4/5/4,
-    9/4/3/2/1/2,
-    10/5/4/2/1/2,
-    11/1/5/5/4/5,
-    12/3/1/2/3/2,
-    13/3/5/2/2/2,
-    14/2/4/5/2/5%
-  } {
-    \pgfmathsetmacro{\xo}{\qfdNH + (\so + 0.5)*\qfdCmpW/6}
-    \pgfmathsetmacro{\xt}{\qfdNH + (\st + 0.5)*\qfdCmpW/6}
-    \pgfmathsetmacro{\xf}{\qfdNH + (\sf + 0.5)*\qfdCmpW/6}
-    \pgfmathsetmacro{\xg}{\qfdNH + (\sg + 0.5)*\qfdCmpW/6}
-    \pgfmathsetmacro{\xs}{\qfdNH + (\sh + 0.5)*\qfdCmpW/6}
-    \coordinate (po-\r) at (\xo, {-\r + 0.5});
-    \coordinate (pr-\r) at (\xt, {-\r + 0.5});
-    \coordinate (pf-\r) at (\xf, {-\r + 0.5});
-    \coordinate (pp-\r) at (\xg, {-\r + 0.5});
-    \coordinate (ps-\r) at (\xs, {-\r + 0.5});
-  }
-
-  % Pass 2: profile lines per alternative. Drawn before markers so the
-  % dots sit on top of (not under) the line endpoints.
-  \draw[qfdalt1ln] (po-1) \foreach \r in {2,...,\qfdNW} { -- (po-\r) };
-  \draw[qfdalt2ln] (pr-1) \foreach \r in {2,...,\qfdNW} { -- (pr-\r) };
-  \draw[qfdalt3ln] (pf-1) \foreach \r in {2,...,\qfdNW} { -- (pf-\r) };
-  \draw[qfdalt4ln] (pp-1) \foreach \r in {2,...,\qfdNW} { -- (pp-\r) };
-  \draw[qfdalt5ln] (ps-1) \foreach \r in {2,...,\qfdNW} { -- (ps-\r) };
-
-  % Pass 3: markers on top of the lines.
-  \foreach \r in {1,...,\qfdNW} {
-    \node[qfdalt1mk] at (po-\r) {};
-    \node[qfdalt2mk] at (pr-\r) {};
-    \node[qfdalt3mk] at (pf-\r) {};
-    \node[qfdalt4mk] at (pp-\r) {};
-    \node[qfdalt5mk] at (ps-\r) {};
-  }
-
-  % ---------- Manual legend (5 alternatives, placed right of zones) ----------
-  \pgfmathsetmacro{\qfdLegX}{\qfdNH + \qfdCmpW + 0.7}
-  \begin{scope}[shift={(\qfdLegX, \qfdHdrH - 0.4)}]
-    \draw[qfdmed, rounded corners=2pt]
-      (-0.15, 0.4) rectangle (5.1, -7.50);
-    % Relations
-    \node[anchor=west, font=\footnotesize\bfseries] at (0, 0.1)
-      {Relation};
-    \draw[qfdthin] (0, -0.15) -- (4.95, -0.15);
-    \node[qfdstrong] at (0.22, -0.5)  {};
-      \node[anchor=west] at (0.5, -0.5)  {Strong (9)};
-    \node[qfdmod]    at (0.22, -0.95) {};
-      \node[anchor=west] at (0.5, -0.95) {Medium (3)};
-    \node[qfdweak]   at (0.22, -1.4)  {};
-      \node[anchor=west] at (0.5, -1.4)  {Weak (1)};
-    % Correlation
-    \node[anchor=west, font=\footnotesize\bfseries] at (0, -2.10)
-      {Correlation};
-    \draw[qfdthin] (0, -2.35) -- (4.95, -2.35);
-    \node[anchor=west] at (0, -2.70) {{$+\!+$}\quad very positive};
-    \node[anchor=west] at (0, -3.05) {{$+$\phantom{$+$}}\quad positive};
-    \node[anchor=west] at (0, -3.40) {{$-$\phantom{$-$}}\quad negative};
-    \node[anchor=west] at (0, -3.75) {{$-\!-$}\quad very negative};
-    % Perception
-    \node[anchor=west, font=\footnotesize\bfseries] at (0, -4.20)
-      {Perception};
-    \draw[qfdthin] (0, -4.45) -- (4.95, -4.45);
-    \draw[qfdalt1ln] (0.05, -4.80) -- (0.45, -4.80);
-      \node[qfdalt1mk] at (0.25, -4.80) {};
-      \node[anchor=west, font=\bfseries] at (0.55, -4.80)
-        {Typoena (v0.1 target)};
-    \draw[qfdalt2ln] (0.05, -5.25) -- (0.45, -5.25);
-      \node[qfdalt2mk] at (0.25, -5.25) {};
-      \node[anchor=west] at (0.55, -5.25) {reMarkable 2 + Type Folio};
-    \draw[qfdalt3ln] (0.05, -5.70) -- (0.45, -5.70);
-      \node[qfdalt3mk] at (0.25, -5.70) {};
-      \node[anchor=west] at (0.55, -5.70) {Freewrite Traveler};
-    \draw[qfdalt5ln] (0.05, -6.15) -- (0.45, -6.15);
-      \node[qfdalt5mk] at (0.25, -6.15) {};
-      \node[anchor=west] at (0.55, -6.15) {Freewrite Smart Typewriter};
-    \draw[qfdalt4ln] (0.05, -6.60) -- (0.45, -6.60);
-      \node[qfdalt4mk] at (0.25, -6.60) {};
-      \node[anchor=west] at (0.55, -6.60) {Pomera DM250};
-    \node[anchor=west, font=\scriptsize\itshape] at (0, -7.15)
-      {0 = poor, 5 = excellent};
-  \end{scope}
-
-\end{qfdhouse}
-\end{document}
-```
-
-## Perception scores (guessed)
-
-Five products on the 0–5 scale, scored against each WHAT. Reference
-configurations: **reMarkable 2 + Type Folio**, **Freewrite Traveler**,
-**Freewrite Smart Typewriter**, **Pomera DM250** (DM250 has a reflective
-monochrome LCD, not e-ink — flagged in W1 / W8). "Typoena" is the v0.1
-target from `qfd.md` §2, not measured yet.
-
-Freewrite Traveler scores assume the
-[Sailfish firmware](https://getfreewrite.com/blogs/writing-success/freewrite-sailfish-firmware)
-(released 2025-11-19), which rewrote the OS in Rust, cut keystroke latency
-40–100 %, and trimmed power draw −30 % typing / −50 % idle on both
-Traveler and Smart Typewriter Gen 3. Three rows rescored upward as a
-result: W1 Traveler 3→4 / Smart 2→3 (Smart's larger panel still trails
-Traveler by one notch), W5 both 3→4 (boot accelerated, no published
-number), W9 both 1→2 (Rust rewrite explicitly unblocked features that
-JS could not carry; still closed so neither reaches reMarkable's
-hackable-Linux 3).
-
-| ID  | WHAT (truncated)                                  | Typoena | reM. | Frw.T | Frw.S | Pom. | Rationale (shortest defensible)                                                                                                                                                                                                                                            |
-| --- | ------------------------------------------------- | :-----: | :--: | :---: | :---: | :--: | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| W1  | Sub-second response to typing                     |    4    |  1   |   4   |   3   |  5   | Typoena targets ≤200 ms; reMarkable e-ink visibly laggy on a typing-focused device — tested less responsive than Smart Typewriter, and latency is so load-bearing for W1 that it earns a 1 not a 2; both Freewrites post-Sailfish trimmed latency 40–100 % (Frw.T plausibly inside 200 ms; Frw.S still trails by one notch on larger panel); Pomera LCD ~zero. |
-| W2  | Publishing is one deliberate action away          |    5    |  4   |   4   |   4   |  2   | Ctrl-G atomic; reMarkable + Freewrite cloud-sync is one-tap but not git; Pomera = USB/SD copy or QR transfer.                                                                                                                                                              |
-| W3  | Pulling power never corrupts the file             |    4    |  4   |   2   |   2   |  2   | Typoena: atomic-rename + fsync. reMarkable journals. Freewrite + Pomera: forum reports of corruption on yank.                                                                                                                                                              |
-| W4  | Provisioning never interrupts writing             |    5    |  2   |   2   |   2   |  5   | Typoena v0.1: build-time config (dev-only). reM/Frw need Wi-Fi + account. Pomera: literally none.                                                                                                                                                                          |
-| W5  | Quick boot to a writing cursor                    |    4    |  3   |   4   |   4   |  5   | Typoena target ≤5 s. reMarkable cold-boots ~20 s (great from sleep). Both Freewrites accelerated post-Sailfish (no published number; were ~10–15 s e-ink wake). Pomera ~3 s.                                                                                               |
-| W6  | Long sessions without crash / lag / drift         |    3    |  3   |   4   |   4   |  5   | Typoena unproven (1 h target). Freewrite famously stable (both variants). Pomera firmware is decades-mature.                                                                                                                                                               |
-| W7  | Nothing on the device competes with prose         |    5    |  2   |   5   |   5   |  5   | reMarkable has apps, menus, drawing, PDFs. Freewrite + Pomera are single-purpose; Typoena by design.                                                                                                                                                                       |
-| W8  | The UI never moves except when I move it          |    4    |  3   |   4   |   4   |  5   | reMarkable animates more; Typoena uses dirty-rects; Freewrites minimal motion; Pomera near-static LCD.                                                                                                                                                                     |
-| W9  | Codebase absorbs the planned roadmap              |    4    |  3   |   2   |   2   |  1   | Modular Rust Typoena; reMarkable is hackable Linux; both Freewrites carry Sailfish (Rust rewrite explicitly unblocked features JS could not carry) but closed; Pomera closed firmware.                                                                                     |
-| W10 | I can repair or fork it with hobbyist tools       |    5    |  4   |   2   |   2   |  1   | Typoena: open BOM + ESP32. reMarkable: rooted Linux + community ROMs. Freewrite + Pomera: closed.                                                                                                                                                                          |
-| W11 | Multi-day battery life (v0.8 onward)              |    1    |  5   |   5   |   5   |  4   | Typoena v0.1 = wall-powered (battery deferred). reMarkable + both Freewrites legendary (~4 weeks; Sailfish trimmed −30 % typing / −50 % idle). Pomera ~24 h.                                                                                                               |
-| W12 | Local-only files coexist with git scope           |    3    |  1   |   2   |   2   |  3   | Typoena v0.5+ design. reMarkable cloud-only. Freewrites have local + Postbox but no VCS. Pomera = pure local.                                                                                                                                                              |
-| W13 | Typography sets a writing-tool tone               |    3    |  5   |   2   |   2   |  2   | Typoena v0.1: single mono (serif option in v1.0). reMarkable: rich type rendering. Freewrite + Pomera: utilitarian.                                                                                                                                                        |
-| W14 | I can carry the device and write away from a desk |    2    |  4   |   5   |   1   |  5   | Typoena v0.1 wall-powered (ADR-008), no enclosure spec yet — desk-bound by design. reMarkable + Type Folio bag-friendly with bulk. Freewrite Traveler is the form-factor reference (~1.6 lb, folds). Smart Typewriter ~5 lb, desk-bound. Pomera DM250 pocketable foldable. |
-
-**Totals** (sum across 14 WHATs, no weighting): Typoena 52, Pomera 50,
-Freewrite Traveler 47, reMarkable 44, Freewrite Smart Typewriter 42
-(Traveler pre-Sailfish 44; Smart pre-Sailfish 39; reMarkable W1 dropped
-3→2→1 across two rounds of author testing — first to 2 after firsthand
-typing, then to 1 once latency was recognised as the dominant W1
-signal). Pomera closing to within 2 of
-Typoena is W14 doing what W14 should — surfacing the dimension on
-which v0.1's tethered MVP loses ground that v0.8 is expected to
-recover. The "Pomera + Wi-Fi + git + hackable BOM" framing from
-`README.md` still holds and reads stronger.
-
-Weighted totals (Σ score × W weight) tell the same story with more
-contrast — left as exercise; the unweighted view is enough to read the
-picture.
-
-### Caveats
-
-- **Single-rater bias.** All thirteen rows are scored from the project
-  author's POV. A reMarkable buyer would weight W11 (battery) at 10 and
-  W12 (git) at 1, flipping the totals.
-- **Configuration matters.** Freewrite Smart Typewriter and Traveler are
-  both tracked; they diverge most on W1 / W5 because of display tech
-  (Smart's larger panel is slower to refresh). Traveler is still the
-  more direct competitor on form factor.
-- **W3 / W6 Freewrite scores are anecdotal.** Forum reports, not bench
-  data. Treat the 2 / 4 as "we'd need to test this" rather than fact.
-- **No price column.** Typoena-as-BOM is materially cheaper than the
-  competitors but cost is not a WHAT in `qfd.md` §1, so it's absent here.
-  Worth a row if a v0.x WHAT ever calls it out.
-
-## Reading the house
-
-- **Importance (left column)** is the raw 1–10 weight from `qfd.md` §1, not
-  a normalised %, so adding stays cheap when a WHAT shifts. Sum of weights
-  is 103; treat each unit as ~0.97 % if you want a percentage view.
-- **Roof** carries the §4 symbols translated into classical QFD glyphs:
-  `++` strong reinforcement (`◎`), `+` mild reinforcement (`○`), `−` mild
-  conflict (`×`), `−−` strong conflict (`⊗`).
-- **Basement rows** are: v0.1 target → §3 column sum (`Σ` of
-  `weight × strength`) → relative weight as integer % of total (1557).
-  Relative weights round to 100.
-- **H7, H10, H15** (Publish latency, binary size, build time) sit at the bottom
-  of the basement — knowingly-paid costs per `qfd.md` §7, not signals to
-  optimise harder.
-
-## Regenerating
-
-The matrix cells (`\node[qfdrel/{S,M,W}]`), roof symbols (`C-i-j` slots),
-and basement Σ + Rel% are native to this file — re-score directly in the
-TikZ source, then update the §3 priority list and §4 conflict list in
-`qfd.md` to match the new picture.
-
-When `qfd.md` §1 or §2 changes:
-
-1. Importance column → §1 weight column.
-2. HOW titles + v0.1 targets → §2 target column.
-3. Recompute basement Σ for any HOW whose column changed: per-cell
-   contribution = `(W weight) × (cell strength: 9 / 3 / 1 / 0)`.
-4. Recompute relative weight: each Σ ÷ total Σ × 100, rounded to integer
-   percent.
-
-Perception scores are **not** derived from `qfd.md` — they live only in
-this file. Update them when (a) a competitor ships a relevant change,
-(b) measurement replaces a guess, or (c) a WHAT is added/removed in §1.
-Each score keeps its one-line rationale in the table above.
-
-If a renderer rejects the `tikz` fence, the file is still readable as
-source — the placement comments name each WHAT, HOW, and cell. The
-perception-scores table above is the human-readable fallback for the
-right-hand zone of the diagram.