Read a GFM pipe table's short rows, rows without a pipe and one column in portableMarkdownToAdf

docs/decisions.md

@@ -388,10 +388,14 @@ and 7. Valid while a refusal is a result and the caller can fix the markdown it
 
 Where GFM's reading of a shape drops content, `portableMarkdownToAdf` refuses the shape. A pipe
 table body row holding more cells than its header is `malformed-pipe-table`, where GFM cuts the
-extra cells. Cutting the cells breaks Goal 7. Building a table GFM does not, such as a wider one, breaks
-Goal 4. A refusal builds no table, but it still breaks Goal 4: a bot gets an error for a row GitHub
-renders. Goal 7 is a Maintain goal, holding whatever it costs, so it wins over Goal 4, an Achieve
-goal.
+extra cells. Cutting the cells breaks Goal 7. Building a table GFM does not, such as a wider one,
+breaks Goal 4. A refusal builds no table, but it still breaks Goal 4: a bot gets an error for a row
+GitHub renders. Goal 7 is a Maintain goal, holding whatever it costs, so it wins over Goal 4, an
+Achieve goal.
+
+A shape whose GFM reading drops nothing is read as GFM reads it: a short body row is padded with
+empty cells, a line holding no `|` after the table is a row of one cell, and `a |` over `--- |` is
+a one-column table.
 
 ## The HTML dialect
 

docs/reading-cost.md

@@ -980,3 +980,20 @@ Read most (opens and searches):
 - `ci.sh` 1
 =======
 >>>>>>> origin/main
+
+## Reading cost, chunk a624aacf239f, finished 2026-11-09T10:24:02Z
+
+167585 new input tokens before the first commit.
+
+Read most (opens and searches):
+
+- `todo.md` 7
+- `README.md` 6
+- `docs/decisions.md` 6
+- `spec/flavour.md` 4
+- `docs/kovetskiy-mark.md` 3
+- `CHANGELOG.md` 2
+- `ci.sh` 2
+- `corpus/README.md` 1
+- `corpus/round-trip/block-nodes/expand.md` 1
+- `corpus/round-trip/block-nodes/panel.md` 1