Always verify exact Git and PR state before continuing

When resuming repository work, first inspect the current branch, working-tree cleanliness, tracking status, local and remote SHAs, recent history, PR base/head revisions, and any upstream movement. Confirm the intended changes remain isolated and that diffs do not include unrelated commits from stale branches or an advanced main branch. Before pushes, rebases, or maintainer updates, preserve the reviewed revision and use guarded operations such as exact force-with-lease checks. Report any divergence, stale metadata, unresolved reviews, or ancestry risks before making changes.