- Tighten rel regex with word boundary to prevent false positives
(e.g., rel="nextsomething" no longer matches).
- Use parsed.origin comparison in validatePaginationUrl to correctly
handle explicit default ports (e.g., :443 for HTTPS).
- Fix pagination safeguard tests to use same-origin URLs so they
actually exercise the 1000-page limit instead of being rejected
by origin validation on the first request.
- Add test for rel="nextsomething" not matching.
- Add test for explicit default port acceptance.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>