The guard used `awk -F'|' '{print NF-1}'` but a markdown header has a leading
and trailing pipe, so NF counts (real columns + 2); NF-1 is always one too
high. The `-eq 5` test was therefore unsatisfiable for the very 5-column
header quick.md writes, so /gsd-fast has never appended a Quick Task row since
PR #85 (regression closing #27).
- Count real columns with NF-2 (5 for the 5-col header, 6 for the 6-col).
- Accept 5 OR 6 columns (quick.md Step 7b writes both shapes).
- Select the appended row template by the detected count so its cell count
always matches the header — keeps #27 fixed for the validate-mode table.
Closes#2133
78b9b04f1d