`--pages` (extract), `--before` (split) and the edit page options accepted
comma lists only, so "1-3,5" was refused as a bad page number. A list now
takes single pages and inclusive ranges, in the order given, with the length
of a range bounded. The out-of-range message, which named the page one too
low in 0.7.1, is pinned by a test now that #1550 fixed it.
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
