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/ClaimedNameHealTests.swift

@@ -194,8 +194,7 @@ struct ClaimedNameDisplacementTests {
         store.displaceClaimedNames()
         try BoardWriter.deleteCardToTrash(
             at: fixture.url("\(Ident.lane1)/\(Ident.card1)"),
-            inBoard: fixture.root,
-            order: 1024
+            inBoard: fixture.root
         )
 
         #expect(fixture.exists(".trash/\(Ident.card1)"))