docs: add handoff review log

docs/handoff-review-log.md

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+# Handoff review log
+
+Use this log to keep a small handoff review clear and easy to verify.
+
+## Handoff start
+
+- Confirm that upstream main is current.
+- Confirm that the local main branch is clean.
+- Confirm that the branch has one clear purpose.
+- Confirm that the planned change is documentation only.
+
+## Handoff evidence
+
+- Record the changed file.
+- Record that the pull request title matches the diff.
+- Record that no secrets or personal data were added.
+- Record that private context stayed out of repository files.
+
+## Handoff close
+
+- Wait for checks before approval.
+- Merge only after review.
+- Confirm that main contains the expected merge commit.
+- Keep follow-up work for a separate branch.