Forgejo's per-review `stale` flag is eventually consistent: seconds
after a push it still reports the pre-push answer, so a verdict against
the previous head reads as current in exactly the window where the CLI
gets run right after pushing.
latest_reviews now fetches the PR head once and ORs a direct comparison
of the review's own commit_id into the flag. Fixing it at construction
rather than at the call sites means superseded() is unchanged and all
three consumers are corrected together: assign-reviewer's refusal,
pr_merge's changes-requested gate, and — the one that matters most —
pr_status's readiness verdict, which could otherwise report a dead
approval as valid.
Unknowns fail toward keeping the verdict: a missing head or commit_id
degrades to today's behaviour instead of voiding every review on the PR.
178eb13993