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/git/worktree-archive-warning.test.ts

@@ -6,11 +6,11 @@ import {
   toWorktreeArchiveRisk,
 } from "@/git/worktree-archive-warning";
 
-describe("worktree archive warning", () => {
+describe("workspace archive warning for worktree backing", () => {
   it("does not require a confirmation for clean and pushed worktrees", () => {
     expect(
       buildWorktreeArchiveConfirmationMessage({
-        worktreeName: "feature",
+        workspaceName: "feature",
         isDirty: false,
         aheadOfOrigin: 0,
         diffStat: null,
@@ -51,7 +51,7 @@ describe("worktree archive warning", () => {
   it("includes every archive risk in the confirmation copy", () => {
     expect(
       buildWorktreeArchiveConfirmationMessage({
-        worktreeName: "risky-feature",
+        workspaceName: "risky-feature",
         isDirty: true,
         aheadOfOrigin: 1,
         diffStat: { additions: 1, deletions: 3 },