Ranker + ticket-gen idempotent

## Что это R4+R5: ranker (severity × surface × confidence + vdiBonus) + ticket-gen с frontmatter firstSeen/lastSeen, idempotent на re-run. ## Критерии приёмки - [ ] rankFindings(findings) → top-K=50 - [ ] ticket-gen: queue.json (gitignored) + docs/tickets/T-\*.md (committed) - [ ] Re-run: same findings → same ticket files (no diff) ## Статус Это задача из текущего backlog'а ROX.ONE (Linear). Текущий статус в Linear: `Triage`. Метки: `История` / `Story`, `Аудит` / `Audit`. ## 🔗 Linear - [PZD-188](https://linear.app/kuhjie/issue/PZD-188/istoriya-ranker-ticket-gen-idempotent) — backing ticket - Parent epic: [PZD-118](https://linear.app/kuhjie/issue/PZD-118)