changelog: May 2026 batch

- Audit log hash chain + in-product verification panel
- Audit log JSONL chain export (Enterprise)
- Trend findings are drillable across 12 rules
- AI provider integrations validate admin keys at save time + 10s probe timeout + expanded SSRF blocklist (mirrors thalian-beta e84ca94)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>