docs: record the item 171 hand test and its final shape

The row still described the multipart/alternative build that was reversed;
the shipped forward sends one part chosen by the Send-as-HTML toggle, with
the original in a read-only pane beside the editor.

1 files changed, 4 insertions, 2 deletions

diff --git a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability-closed.md b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability-closed.md
index 77d4726..81705a2 100644
--- a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability-closed.md
+++ b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability-closed.md
@@ -9085,6 +9085,8 @@ policy since `QSplitter` has no getter); and moving the editor into a splitter
 broke `theComposerSplitsItsToolbarByScope`, which looked for the body directly
 in the composer's column.
 
-Still to do: the hand test of the new arrangement. Forward a real HTML message
-with the box checked and unchecked and confirm what arrives.
+Hand-tested 2026-08-28: the split pane reads well, and a real HTML message
+forwards correctly with the strip box both checked and unchecked. The
+recipient sees the original's formatting either way; with the box checked the
+remote images are gone and the layout survives without them.