GPT review of the 1.19 rebase found the test header still called the PRD a candidate and the rebase record placed lines 793 and 645 in the wrong requirements. Comment and record only; no assertion changes.
Adds agents/gosalyn/work/disk-prd118/REBASE-1.19.md: the cherry-pick
conflicts and their resolutions, every label moved to 1.19 and every 1.18
kept, the byte check against fd9ae104d with version labels normalized, and
the test runs and version mutant.