@type backend() :: :git | :hash

@type t() :: %AgentSessionManager.Workspace.Diff{
  backend: backend(),
  changed_paths: [String.t()],
  deletions: non_neg_integer(),
  files_changed: non_neg_integer(),
  from_ref: String.t() | nil,
  insertions: non_neg_integer(),
  metadata: map(),
  patch: String.t() | nil,
  to_ref: String.t() | nil
}