docs(niri): portable desk runs landscape, HDMI left of the laptop

record the normalized layout that landed on main as 9b88208 and the law
that surprised it: positions are absolute, so rotating a panel widens
its logical box and every x to the right of it moves — recompute the
row, never just the rotated block.

omp-docs/log.md

@@ -27,8 +27,8 @@ long form.
 ### A desk with no matching profile is silently misconfigured
 
 `desk-2-portable.kdl` stopped being a skeleton: the two PM1601 16" panels are
-identity-keyed (`PNP(XYM) PM1601 0000000000000`, `… demoset-1`), the laptop sits
-centred against their 1920-tall band, and `display.kdl` points at it. Law: a rig
+identity-keyed (`PNP(XYM) PM1601 0000000000000`, `… demoset-1`), laid out
+landscape either side of the laptop, and `display.kdl` points at it. Law: a rig
 with no eligible profile does not run "unchanged" — it runs whatever the *last*
 profile said. Here that was the home profile, whose Sceptre identity block never
 matched and whose connectors still carried `3440x1440@180.000`, so niri fell back

omp-docs/tools/niri/displays.md

@@ -60,20 +60,28 @@ the ultrawide wins when present and the laptop panel is the fallback.
 
 ## The desk-2 rig (portable)
 
-Laptop plus two 16" PM1601 panels in portrait, side by side as one 2400x1920
-band. Profile: `cfg/desk-2-portable.kdl` (`display.kdl` symlinks to it).
+Laptop flanked by the two 16" PM1601 panels, all three landscape. Profile:
+`cfg/desk-2-portable.kdl` (`display.kdl` symlinks to it).
 
 ```
-┌──────────────┬──────────┬──────────┐
-│              │  PM1601  │  PM1601  │   eDP-1     1920x1080  normal  x=0,y=420
-│              │  rot 90  │  rot 90  │   DP-2      1200x1920  rot 90  x=1920,y=0
-│   eDP-1      │ 1200x1920│ 1200x1920│   HDMI-A-1  1200x1920  rot 90  x=3120,y=0
-│  1920x1080   │  (DP-2)  │(HDMI-A-1)│
-│              │          │          │   The laptop is pinned 420 px down so its
-└──────────────┴──────────┴──────────┘   centre (960) meets the band's centre:
-   x=0,y=420      x=1920,0   x=3120,0    no dead corner when the cursor crosses.
+┌──────────┬──────────────┬──────────┐
+│  PM1601  │              │  PM1601  │   HDMI-A-1  1920x1200  normal  x=0,y=0
+│ 1920x1200│   eDP-1      │ 1920x1200│   eDP-1     1920x1080  normal  x=1920,y=60
+│(HDMI-A-1)│  1920x1080   │  (DP-2)  │   DP-2      1920x1200  normal  x=3840,y=0
+│          │              │          │
+└──────────┴──────────────┴──────────┘   The laptop is 60 px down so it is
+   x=0,y=0     x=1920,y=60   x=3840,y=0    centred against the taller panels.
+
+HDMI-A-1 sits to the LEFT of the laptop by request (2026-10-30); DP-2 keeps the
+right. Earlier the same rig ran both panels in portrait (rot 90, 1200x1920) with
+the laptop and both panels to its right — the rotation is `normal` now, so the
+panels are 1920 wide and every x moved.
 ```
 
+Positions are absolute in logical space, so rotating a panel changes its logical
+width (1200 → 1920) and every x to its right; recompute the whole row, never just
+the rotated block.
+
 All three blocks are identity-keyed and pin their mode string verbatim. The
 `requires:` list names all three panels, so the matcher only claims this profile
 when the whole rig is present — unplug one 16" panel and the watcher leaves the