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