Reviewer Signature

- A human (or another agent) **reviews and signs** an edit after it is made. - Used to signal trust, approval, or certification of safety. - Multiple reviewers may sign the same entry or ghost page. Fields: - `sig_type`: `"review-signature"` - `reviewed_by`: reviewer ID - `reviewed_at`: timestamp - `review_note`: optional comment - `trust_level`: optional (e.g. `"endorsed"`, `"sandbox"`)