approval-attestation GitHub numeric event IDs

Trap: treating GitHub issue-event IDs as strings looks correct because attestation payloads serialize IDs as strings, but the live issue-events API returns numeric IDs; strict type comparison makes currentAcceptedEvent() return null. Fix: normalize decimal event IDs before comparison. Do not use BigInt here: it seems safest for large IDs, but this project’s ESLint environment flags BigInt as undefined; use a strict decimal-ID comparator instead.