* 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
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