A board's ``default_workdir`` (e.g. ``hermes kanban boards
set-default-workdir my-board /path/to/real/source``) is copied into
``tasks.workspace_path`` for tasks created without an explicit
``workspace_kind``. Those tasks default to ``workspace_kind='scratch'``,
so completion calls ``_cleanup_workspace`` and unconditionally runs
``shutil.rmtree(wp, ignore_errors=True)`` — deleting the user's real
source tree as if it were disposable scratch storage.
Add ``_is_managed_scratch_path()`` and gate ``_cleanup_workspace`` on
it: only delete paths under ``HERMES_KANBAN_WORKSPACES_ROOT`` (the
worker-side override the dispatcher injects) or under the active kanban
home's ``kanban/`` subtree (covering both the legacy default-board root
and per-board ``kanban/boards/<slug>/workspaces`` roots). Anything else
gets a warning log and is left alone, so a misconfigured
``default_workdir`` can no longer destroy user data on task completion.
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