Let the file own why the row cap is conditional; the README states that it is

Plugin/unraid/README-unraid.md

@@ -110,12 +110,11 @@ naming every card on the Monitor grid, its width and its order, and generates th
 from it — the column ladder, the span clamps at each width, the row-height cap, and the
 compensation when a conditional card is absent. Column counts are 8/4/2/1 and spans are 1/2/4/8,
 which is what lets the board re-cut itself at any width with no holes and no hand-placed card.
-Breakpoints are arithmetic over `VV_MON_CARD_FLOOR`, never chosen by eye. The row-height cap is
+Breakpoints are arithmetic over `VV_MON_CARD_FLOOR`, never chosen by eye, and the row-height cap
-conditional on the same arithmetic: it applies only where a rung fits one screen, because a rung
+is conditional on the same arithmetic — it applies only where a rung fits one screen.
-with more rows than that scrolls the page however its rows are sized, and capping there would clip
+`pages/monitor.php` carries the card bodies and nothing about where they go; moving a card is
-every card to buy nothing. `pages/monitor.php` carries the card bodies and nothing about where
+moving a line in that array. The page cross-checks the declaration against the cards that
-they go; moving a card is moving a line in that array. The page cross-checks the declaration
+actually rendered and says so in the browser if they disagree.
-against the cards that actually rendered and says so in the browser if they disagree.
 
 **Caching.** Several endpoints serve from `$VV_CACHE_DIR` (`/tmp/varaverk/api`, tmpfs) rather than hitting live
 APIs on every page view, refreshed by `Tools/api_cache_writer.sh`. `?live=1` bypasses the

Plugin/unraid/include/monitor_board.php

@@ -13,9 +13,14 @@
 //   Powers of two, all the way down.
 //       Column counts are 8, 4, 2, 1 and every span is 1, 2, 4 or 8. That pairing is what makes
 //       the board tile with no holes at every width without a single hand-placed card: 32 span
-//       units divide into 8 columns as 4 rows, into 4 as 8 rows, into 2 as 16, into 1 as 32.
+//       units divide into 8 columns as 4 rows and into 4 as 8. A rung of 6 or 10 columns does
-//       A rung of 6 or 10 columns does not divide a span of 4, which is why the previous ladder
+//       not divide a span of 4, which is why the previous ladder needed a per-breakpoint
-//       needed a per-breakpoint override for every wide card and still left holes.
+//       override for every wide card and still left holes.
+//
+//       Below four columns the arithmetic stops being a division. Spans clamp to the column
+//       count, so a span-4 card contributes 2 at two columns and 1 at one, and the board is 13
+//       rows and then 18 rather than the 16 and 32 a naive division predicts. It still tiles
+//       without holes, for a different reason: a clamped card fills its row outright.
 //
 //   Breakpoints are arithmetic, not taste.
 //       A column count is viable exactly when the cards still fit: