docs: record the card list, and correct what CLAUDE.md claims

The architecture section described ThreadListView as existing to paint a strip
across columns. That was true until this change and is now the opposite of true:
it survives only for the expander hit-test. Kept as one paragraph of history,
since it explains the file's shape, but no longer stated as current behaviour.

Two traps are recorded inverted rather than deleted, because the rule survived
its own reason changing. The reply indent is still asserted on where the TEXT
lands, but where visualRect lies has flipped: it used to report an indent the
text did not have, and now reports none while the text is indented. And Q_ENUM
is documented as insufficient for a queued Q_ARG, which cost a silently dropped
sort argument.

Item 60's recorded cause was wrong and is corrected in place. It was read off
master, where the row arithmetic really is current.row() + 1; the branch had
already fixed it a commit earlier with threadRowOf(). The entry stays, with the
correction, because the reasoning was sound and the tests it demanded now exist.

Items 20, 51 and 53 are marked built on the branch rather than done. Nothing is
merged and the user has not seen it, which is the whole point of Task 10.

1 files changed, 21 insertions, 9 deletions

diff --git a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
index 17cf434..ad6dbc0 100644
--- a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
+++ b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
@@ -77,7 +77,7 @@ taking that too literally.
 | 17 | No completion for tags in the query bar | workflow | M | **done** |
 | 18 | No visual cue that there are unsynced edits | feedback | S | **done** |
 | 19 | No prompt to sync on exit when edits are pending | behavior | S | **done** |
-| 20 | Thread view does not match the user's mental model | presentation | L | built on branch `item-20-message-rows`, **not merged**; see 53 |
+| 20 | Thread view does not match the user's mental model | presentation | L | rebuilt as cards on branch `card-list`, **not merged**; awaiting the user's verdict |
 | 21 | Default shortcuts are not sensible enough | discoverability | S | open |
 | 22 | Translatability audit and i18n wiring | correctness | M | open |
 | 23 | No way to save a search query from the UI | workflow | M | open |
@@ -108,16 +108,16 @@ taking that too literally.
 | 48 | Removing a tag suggests every tag, not the thread's own | workflow | XS | **done** |
 | 49 | Sync runs every account regardless of what changed | workflow | M | **done** |
 | 50 | Esc blanks the pane but leaves the row selected | workflow | XS | **done** |
-| 51 | Clicking a subject scrolls the list sideways | presentation | XS | open; resolved as a side effect of 53, do not work separately |
+| 51 | Clicking a subject scrolls the list sideways | presentation | XS | built on branch `card-list`, **not merged**; a card is viewport width |
 | 52 | `test_querycompleter` fails under Wayland, passes offscreen | testing | XS | **done** |
-| 53 | Message rows still read as a table, not as a conversation | presentation | M | open, specified 2026-08-09; see the card-list spec |
+| 53 | Message rows still read as a table, not as a conversation | presentation | M | built 2026-08-10 on branch `card-list`, **not merged**; awaiting the user's verdict |
 | 54 | A cron sync carries the edits but the count still says pending | correctness | S | **done** |
 | 55 | In a narrow window the message pane is invisible | presentation | XS | **done** |
 | 56 | No action carries an icon, so the toolbar reserves space for nothing | presentation | S | **done** |
 | 57 | "Flag" would read better as "Important" or "Starred" | presentation | XS | **done** |
 | 58 | `message_zoom` documents a 0.5 to 3.0 range and enforces none of it | correctness | XS | **done** |
 | 59 | Archive and Mark all read shipped with the same icon | presentation | XS | **done** |
-| 60 | Next thread dead-ends on the last reply of an expanded thread | defect | XS | open; branch only, fix as part of 53 |
+| 60 | Next thread dead-ends on the last reply of an expanded thread | defect | XS | **done** on the branch; already fixed by 5487d58, see below |
 
 Sizes are rough: XS under an hour, S a sitting, M a session.
 
@@ -3683,11 +3683,23 @@ navigation actions against the same rule.
 current index, which follow visible rows across parent boundaries. For
 thread-to-thread jumping, skip any index whose `IsMessageRole` is true.
 
-**Specified as part of the card-list spec**
-(`docs/superpowers/specs/2026-08-09-card-list-design.md`), which also adds
-Alt+Up/Down for these actions and relies on `QTreeView`'s built-in Up/Down for
-stepping through replies. Fix it there rather than separately, unless the card
-list is dropped.
+**The cause above is wrong, and was corrected on 2026-08-10.** It was read off
+`master`, where the arithmetic really is `current.row() + 1`. The branch does
+not do that: `5487d58` added `MainWindow::threadRowOf()`, which walks up to the
+containing thread BEFORE the arithmetic, so from the last reply of an expanded
+thread `next_thread` already reached the next thread. The defect was fixed in
+the same commit that could have introduced it, one commit before this entry was
+written. Verified by writing both failing tests first, on the branch, and
+watching them pass against unchanged code.
+
+The entry is kept rather than deleted, because the reasoning it records is
+sound and the tests it demanded now exist. It is a reminder that a cause
+"verified in code" is only verified against the branch it was read on.
+
+**Superseded by the card-list work all the same.** Both actions now walk with
+`indexBelow`/`indexAbove` (`card-list`, 2026-08-10), so nothing in that path is
+keyed on a row number, which is the rule a deeper tree would break next.
+Alt+Up/Down were added alongside Ctrl+J/K there.
 
 **Constraint.** The test that would catch this must start from the **last reply
 of an expanded thread**. A test that arrows down a collapsed list passes against