fix(kanban): use get_default_hermes_root() in list_profiles_on_disk

Path.home() / ".hermes" / "profiles" breaks custom-root deployments
(e.g. HERMES_HOME=/opt/data). Switch to get_default_hermes_root() so
profile discovery is consistent with kanban_db_path() and
workspaces_root() fixed in #18985.

Fixes #19017.
Related to #18442, #18985.

hermes_cli/kanban_db.py

@@ -2732,7 +2732,8 @@ def list_profiles_on_disk() -> list[str]:
     ``config.yaml`` — a bare dir without config isn't a real profile.
     """
     try:
-        home = Path.home() / ".hermes" / "profiles"
+        from hermes_constants import get_default_hermes_root
+        home = get_default_hermes_root() / "profiles"
     except Exception:
         return []
     if not home.is_dir():