v0.3.1

Fixed

• select now orders multiple INDEX@RANGE selectors that address the same
  sub-hunk by their first added line, so two disjoint ranges given in any order
  (e.g. 1@3-4 1@1-2) emit in ascending new-file order and apply cleanly
  instead of being rejected as overlapping.
• Overlapping added-line ranges of one sub-hunk (e.g. 1@1-3 1@2-4) are now
  rejected as a selector error (exit 2) before emission, so they can no longer
  slip past --no-verify-result-diff-internal as a corrupt diff.
• A malformed selector now reports the specific reason it was rejected — a
  reversed range, a zero bound, or a non-numeric bound — instead of a bare
  bad selector: <text>.

Tests

• Added unit and end-to-end coverage for range ordering, overlap rejection
  (including under --no-verify-result-diff-internal), and the specific
  bad-selector reasons.