v0.4.0

• Send the interactive hint on every transaction. The daemon treats an
  absent hint as false, which strips ALLOW_USER_INTERACTION from its polkit
  check — so any transaction needing authorization failed synchronously with
  PkError.notAuthorized and a 0 ms runtime, on any host where the polkit
  action is auth_admin and the caller is not root.
• Add PkClient.connect({bool interactive = true}) and the matching
  PkClient.interactive getter. Interactive is the default: transactions that
  need authorization now prompt instead of failing. Pass interactive: false
  for unattended callers that must fail fast rather than block on a prompt —
  it suppresses the prompt, it does not grant authorization.
• Document authorization on WSL, where polkit cannot reliably prompt because
  a logind session owned by the calling user is often absent. Recommends
  running as root, with a narrowly scoped polkit rule as an opt-in
  alternative, plus how to tell a session problem from a real denial.
• C ABI change: pk_transaction_set_hints takes a third parameter,
  bool interactive. Consumers linking libpackagekit_nc directly must
  update their declaration; consumers using the build hook are unaffected,
  as it compiles the library from source.