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/App/BoardWindowHost.swift

@@ -44,8 +44,8 @@ struct BoardWindowHost: View {
     @State private var boardInfo = BoardInfoPresentation()
 
     /// This window's purge alert, open or not (03-board-ui.md § Trash). `@State` for `boardInfo`'s
-    /// reason and reaching the menu bar the same way: Delete Immediately and Empty Trash… are
-    /// menu-bar items, and a menu item cannot present anything of its own.
+    /// reason and reaching the menu bar the same way: File ▸ Delete (landing on a trash selection)
+    /// and Empty Trash… are menu-bar items, and a menu item cannot present anything of its own.
     @State private var trashConfirmations = TrashConfirmations()
 
     /// How Board ▸ Open Card reaches this window's card windows. `@State` for `boardInfo`'s reason,