Address sonnet-review feedback on PR #106:
- Document that the type assertion in supersedeOldReviews is guaranteed to
succeed given the caller's provider switch, with the !ok branch guarding
against future refactors (comment 18889).
- Clarify that vcsURL is only used in the Gitea path for constructing
review permalink URLs (comment 18890).
- Add note explaining why the page-limit warning in ListReviews only fires
when the final page is full, confirming the logic is intentional
(comment 18891).