Realign code with the 2026-07-31 rulings

The trash sorts by modified descending — the arrival rank mint retires
(Ranks.isOrderedForTrash one comparator, loader + merged order agree;
the legacy deleted: migration stamps modified from the tombstone
timestamp where parseable; delete undo steps validate existence-only;
agent guide v8). Trash selection goes kind-blind — ranges, marquee,
Select All, and the successor walk sweep both kinds; the guard moves to
the exits (mixed-payload drop refusal, copy/cut validation). The copy
stamping preflight widens back to comment depth (load-scoped posture —
the board always loads, the gesture refuses whole). Fixes a latent
no-op: trashed-lane drag restore never fired (DragSession.beginLanes
hard-coded the board container).

2403 tests in 413 suites green.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97

Kanban/App/UITestLaunch.swift

@@ -498,13 +498,10 @@ enum UITestLaunch {
 
         // The delete goes last so the trashed card's identity is one the lanes above have already
         // finished with — and through the ordinary delete door, so `.trash/` ends up holding exactly
-        // what a user's ⌘⌫ would have put there, stamps and `order` included.
+        // what a user's ⌘⌫ would have put there: the `modified` stamp that positions it, its `order`
+        // riding along untouched.
         let doomed = cardURLs[trashedCardIndex.lane][trashedCardIndex.card]
-        try BoardWriter.deleteCardToTrash(
-            at: doomed,
-            inBoard: root,
-            order: Ranks.append(toVisible: [] as [Double])
-        )
+        try BoardWriter.deleteCardToTrash(at: doomed, inBoard: root)
 
         return root
     }