v0.4.0

Added

• Messages-only recall — /rewind conversation <n> cuts the messages and leaves every file alone,
  and the confirmation dialog offers the same choice as a scope control. This is the case where the file
  work was right and only the message was wrong; before it, the only way was to recall with files and
  put them back by hand. That scope keeps the range's before-images and snapshots — no file was touched,
  so those are the only record that could ever restore them.
• /rewind plan conversation <n> — the preview answers for the scope the recall will use, so the dialog
  never lists a file it will not touch.

Changed

• The workspace snapshot is taken when a turn opens, not at its first writing tool. That earlier
  moment came after you may have edited files by hand, so a recall treated those edits as the range's
  own work and undid them; a recall now returns the directory to the state it had when the message was
  sent. A failed snapshot releases its claim, so a later tool call can still take one.

Fixed

• The messages-only preview resolved ordinal 0 — the preview verbs were enumerated by hand when the
  ordinal was extracted and the new one was missing from that list, so a perfectly recallable message
  was answered as "cannot recall".