List sandboxes visible to the authenticated caller.
Returns the union of:
copass_sandboxes.user_id == caller).
These are marked access="owner", is_external=False.sandbox_connections grant
against (migration 058). These are marked access=<role>,
is_external=True.Filter by owner_id to return only sandboxes belonging to a specific
end-user in your system. owner_id filtering applies to the owned
subset only; connected sandboxes are always included based on the
grant — filter client-side if you need to narrow them.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.