Realign code with the 2026-07-30 findings-resolution rulings

Delete Immediately is removed entirely (ruling ae1dd96, Redesign card
d40bfac1): the delete vocabulary is purely staged — board → trash,
trash → permanent (confirmed on no-git boards), Empty Trash for bulk.
Gone: File ▸ Delete Immediately (⌥⌘⌫) and its validation, both
⌥-alternate context rows (card + the permanently-disabled lane row),
the VO custom action, BoardStore.deleteImmediately,
TrashModel.canDeleteImmediately, TrashConfirmations' .purge action
(zero surviving callers — trash-side Delete always used
.deleteTrashCards), and the pinning tests. purgePrompt drops its
now-single-purpose container parameter (.trash is the only surviving
caller). BoardWriter.purgeItem survives — create-undo rollback still
needs it — with its comment rewritten. README's trash paragraph drops
the ⌥⌘⌫ sentence.

The other 2026-07-30 rulings (2ec2c95 registry freshness stamp,
c741b02 unified-log-as-coerce-consumer) required no code changes —
already conformant.

Both schemes 1844 tests / 318 suites green.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

Kanban/LiveStore/BannerCenter.swift

@@ -732,10 +732,11 @@ public final class BannerCenter {
     /// does not: the enum knows an item's title, never its *kind*, so an untitled failure says
     /// "the item" rather than guessing "card" and being wrong about a lane.
     ///
-    /// The trash verbs match the commands the user pressed — **Delete**, Delete Immediately, Empty
-    /// Trash — which is 03-board-ui.md § Trash's naming constraint, settled with the trash UI copy: "Finder's 'Move to Trash' phrasing is reserved for the system Trash; board deletion says
-    /// 'Delete'". A banner saying a card could not be *moved to the trash* would name the wrong one
-    /// of the app's two trashes (the card window's attachment Remove is the other).
+    /// The trash verbs match the commands the user pressed — **Delete**, Empty Trash — which is
+    /// 03-board-ui.md § Trash's naming constraint, settled with the trash UI copy: "Finder's 'Move to
+    /// Trash' phrasing is reserved for the system Trash; board deletion says 'Delete'". A banner
+    /// saying a card could not be *moved to the trash* would name the wrong one of the app's two
+    /// trashes (the card window's attachment Remove is the other).
     private nonisolated static func actionPhrase(for operation: WriteOperation) -> String {
         switch operation {
         case .createBoard: