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/e2e/workspace-archive-shortcut.spec.ts

@@ -0,0 +1,26 @@
+import { existsSync } from "node:fs";
+import { expect, test } from "./fixtures";
+import { gotoAppShell } from "./helpers/app";
+import { seedWorkspace } from "./helpers/seed-client";
+import { expectWorkspaceAbsentFromSidebar, selectWorkspaceInSidebar } from "./helpers/sidebar";
+import { waitForSidebarHydration } from "./helpers/workspace-ui";
+
+test.describe("Workspace archive shortcut", () => {
+  test("archives the selected workspace without removing its local checkout", async ({ page }) => {
+    const workspace = await seedWorkspace({ repoPrefix: "archive-shortcut-" });
+
+    try {
+      await gotoAppShell(page);
+      await waitForSidebarHydration(page);
+      await selectWorkspaceInSidebar(page, workspace.workspaceId);
+
+      const modifier = process.platform === "darwin" ? "Meta" : "Control";
+      await page.keyboard.press(`${modifier}+Shift+Backspace`);
+
+      await expectWorkspaceAbsentFromSidebar(page, workspace.workspaceId);
+      expect(existsSync(workspace.repoPath)).toBe(true);
+    } finally {
+      await workspace.cleanup();
+    }
+  });
+});