Stale changelog fragment: rpt listed as 'did not move' but d-morrison/rpt now 301-redirects to Morrison-Lab/rpt

[d-morrison]

changelog.d/retarget-doc-urls-after-org-move.fixed.md:21 says: "Repositories that did not move -- qwt, rme, rpt -- are untouched."

But rpt has since moved: curl -sI https://github.com/d-morrison/rpt returns 301 -> https://github.com/Morrison-Lab/rpt, and gh repo view resolves both to Morrison-Lab/rpt. So the fragment's claim that rpt is untouched is now stale, and it misled an automated review on #408 into flagging a correct Morrison-Lab/rpt link as wrong.

Fix: drop rpt from the 'did not move' list in that fragment (leaving qwt, rme), and grep the repo for any remaining d-morrison/rpt references that should now be Morrison-Lab/rpt. (CLAUDE.md:419 still says d-morrison/rpt in a historical 'Ported from' note -- that one is arguably fine as history, but worth checking.)

[d-morrison]

Working on this — paws off until I'm done.