Comments, phase 1 — storage, writer primitives, and the undo inventory

The kind: comment field table lands in IntegrityRules (the per-kind
hook's first exercise), CommentThread reads one card's thread
window-scoped (the board walk stays O(cards)), and CommentWriter gains
the five gestures: draft save, post (rename .draft to a fresh UUID,
created/modified restamped in the bracket), edit, delete into
comments/.trash/, and the purge with its crash-residue memo. Post and
delete register move-based undo steps; draft saves, edits, and the
purge deliberately register nothing (13's no-capture rule). Copy
boundaries strip comments/.trash, carry .draft verbatim, and remint
threads; comments graduates to a displacing claimed name, with .draft,
.trash, and a comment's attachments claimed one level down.
CommentPath classifies changed paths into the 06 verb family for
later announcer/composer wiring.

One stated narrowing pending a ruling (filed on the findings board):
the copy transaction's refuse-whole preflight stays cards-and-lanes —
an unstampable copied comment copies verbatim with a log line, because
comment defects never refuse.

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

Kanban/History/HistoryPhrase.swift

@@ -64,12 +64,17 @@ public enum HistoryPhrase {
         case card
         case lane
         case board
+        /// One comment. Only `.delete` reaches it: posting has its own phrase (`comment`, below), and
+        /// the draft save, the inline edit and the trash purge register no step at all
+        /// (13-native-undo.md — no byte capture in any tier, and the permanent-delete posture).
+        case comment
 
         var singular: String {
             switch self {
             case .card: "Card"
             case .lane: "Lane"
             case .board: "Board"
+            case .comment: "Comment"
             }
         }
 
@@ -78,10 +83,22 @@ public enum HistoryPhrase {
             case .card: "Cards"
             case .lane: "Lanes"
             case .board: "Board"
+            case .comment: "Comments"
             }
         }
     }
 
+    // MARK: The comment family
+
+    /// **The post's phrase** — 06-history-undo.md's path-shaped "Comment on '⟨card⟩'" as a menu
+    /// title, which is the verb on its own.
+    ///
+    /// Not `name(_:kind:count:)` with a `Verb.comment`, because the composition would read "Comment
+    /// Comment": here the verb already names its object, which is `Kind.board`'s count-less rule
+    /// arriving from the other direction. The destination clause a commit subject carries ("on 'Fix
+    /// login'") is dropped exactly as every other phrase drops it — a menu row has to stay short.
+    public static let comment = "Comment"
+
     // MARK: Composition
 
     /// The phrase for one gesture: `"Move Card"`, `"Move 3 Cards"`, `"Restyle Board"`.