[Gaurav-Gosain]

The task board in the agents view (b) now shows one column per stage, side by side, like a classic kanban board. The list it showed before is still there behind B.

What it does

• One column per stage that [tasks] stages shows, in stage order, with the count in each head. A column with no card, and a folded column, take only the width of their head, so the columns with cards get the room.
• A card shows its title (two lines at most), its holder's state mark and name, or Blocked and why, or free, and its id and age on the right.
• The cursor's card carries the accent bar and the cursor ground, through the same RowState and 16-colour mark the list uses. All colours come from the cockpit look, so there are no literals.
• Done starts folded, as in the list. F or a click on the head opens it, and open it lists the newest card first.
• When the columns do not fit, the board shows the run of columns round the cursor, and the head row counts the hidden ones on each side (3›). Each column scrolls on its own and keeps the cursor's card in view. Under 80 columns the board falls back to the list.

Keys and mouse

• h l and the arrows go between columns. j k go between cards.
• H L, or shift+left shift+right, move the card to the stage before or after, through set-task-stage. They work in the list too.
• enter goes to the holder's pane. On a free card it opens the New agent sheet on the card, which is what n on a card did in the list.
• n adds a card to the column under the cursor, in the session you are attached to, through add-task.
• t takes a card, as before. B switches between columns and list, and tuios keeps the choice in the state file.
• A click selects a card, a double click goes to the pane, and a drag onto another column moves the card there. During the drag the target column lights up and the card's title follows the pointer.

I made the columns the default, because they read well at 100 columns and wider. The list stays one key away.

Proof

I extended TestTaskBoardGroupsCardsByStage and did not add a new test. It now checks the following:

• The board opens as columns in stage order, and B switches to the list and back.
• L then H move t4 to review and back. h with shift+right and shift+left move t2. A drag moves t6 onto the empty Review column and back onto Todo.
• Each move is read back from tuios task ls --json.
• Under 80 columns the board is the list.
• With [tasks] stages set, only the stages it names have columns.

The negative controls are in NEGATIVE_CONTROLS.md. With kanbanStep cut, L leaves t4 in verify. With the drop not calling set-task-stage, the drag leaves t6 in todo. Both fail the test, and the fixed build passes.

Idle cost: no timer. Every redraw comes from a key, a click, a pointer move during a drag, or a task event. The frame cache key is the same as before, and a drag or the new-card line marks the frame transient only while it is open.

Binary size, linux/amd64, release flags: 46,919,840 on main, 46,997,664 here, so +77,824 bytes. That leaves 2,336 bytes under the 47,000,000 ceiling. darwin/arm64 is 43,774,002. I replaced a generic stable sort with slices.Reverse to get under, but the room left is small.

just check --changed passes. fix and deadcode only report.

Frames

Columns at 200x55, after a key move, and during a drag:

At 160x45 and 100x30, dark, light and 16 colours:

[github-actions]

Binary size

target	this change	main	change	room under the ceiling
darwin/arm64	43790642 bytes	43707250 bytes	+83392 bytes (+81.4 KiB)	3209358 bytes
linux/amd64	46997664 bytes	46919840 bytes	+77824 bytes (+76.0 KiB)	2336 bytes

The ceiling is 47000000 bytes for each target. Main's size is from main at f75ac39 (https://github.com/Gaurav-Gosain/tuios/actions/runs/41796786838).

State the size cost in the pull request body. CI fails only above the ceiling.