v0.10.3

Added

• plane init --sections prints the documented instance.yaml sections your
  instance does not set, ready to append (>> instance.yaml). An instance
  created before an adapter existed never heard that the adapter has a
  section, because the starter file is written once and then left alone; the
  only hint was diffing the shipped example by eye. Re-running plane init
  on an existing instance now names the unadopted sections too, so the
  command you already know is what tells you. It writes nothing: the file is
  yours, and a config that edits itself is one you no longer know the shape
  of.

Fixed

• Every prompt now answers the same way when there is nobody to ask. Nine
  sites each caught their own idea of a missing stdin, and none caught the
  RuntimeError Python raises when the descriptor itself is gone, so a verb
  run without stdin ended in a traceback rather than a decline. They share
  one helper: an answer comes back from a terminal or a pipe, and None
  comes back when stdin has ended, is detached, or is closed, which each
  caller turns into its conservative branch. Piped answers keep working
  deliberately, since plane apply has no flag that would replace them.