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

KanbanTests/InertGitTests.swift

@@ -186,7 +186,7 @@ struct InertGitTests {
         // the pair most likely to notice a `.git` at the root: the first walks into `<root>/.trash/`
         // and the second walks back out of it.
         try BoardWriter.deleteCardToTrash(
-            at: board.url("\(board.laneA)/\(board.card1)"), inBoard: board.root, order: 1024
+            at: board.url("\(board.laneA)/\(board.card1)"), inBoard: board.root
         )
         _ = try BoardWriter.moveItem(
             at: BoardWriter.trashFolder(inBoard: board.root).appendingPathComponent(board.card1),