v0.9.0

• The Classify distribution line is written to Messenger::CHANNEL_STDERR
  instead of CHANNEL_STDOUT, so it survives a run that contains a failure.
  Testo's terminal renderer writes the stderr channel through as-is and streams
  every other channel only at -v, rescuing a stdout message at normal
  verbosity solely when the whole run holds one passing test — so in a real
  suite the distribution was never shown, and specifically not on the red run,
  which is when Classify::when() and Classify::label() are read at all. The
  level stays Info; only the channel decides visibility. The PHPUnit adapter
  already printed both lines unconditionally.
• Requires rasuvaeff/property-testing-core ^0.9, where an environmental skip
  no longer spends the discard budget: a machine missing a dependency is no
  longer told to narrow generators that were never at fault. The excessive-
  discard warning printed here reads the engine's discard counter, so it stops
  firing on such a machine without a change of its own.