Archive any workspace from the app (#2003)

* feat(app): expose archive for every workspace

Workspace actions now archive one workspace by id. The daemon remains responsible for backing-specific cleanup, including removing a managed worktree only after its final workspace is archived.

* refactor(app): clarify archive descriptor name

* fix(app): preserve workspace archive safety

* fix(app): allow archive without upstream

* refactor(app): remove stale archive callback

* test(app): cover workspace archive ownership

packages/app/src/keyboard/keyboard-action-dispatcher.ts

@@ -29,7 +29,7 @@ export type KeyboardActionId =
   | "sidebar.toggle.right"
   | "workspace.new"
   | "worktree.new"
-  | "worktree.archive";
+  | "workspace.archive";
 
 export type KeyboardActionDefinition =
   | { id: "agent.interrupt"; scope: KeyboardActionScope }
@@ -60,7 +60,7 @@ export type KeyboardActionDefinition =
   | { id: "sidebar.toggle.right"; scope: KeyboardActionScope }
   | { id: "workspace.new"; scope: KeyboardActionScope }
   | { id: "worktree.new"; scope: KeyboardActionScope }
-  | { id: "worktree.archive"; scope: KeyboardActionScope };
+  | { id: "workspace.archive"; scope: KeyboardActionScope };
 
 export interface KeyboardActionHandler {
   handlerId: string;