Razvan Dimescu 5d9a3a809b feat: DoT client, recursive optimization, bench refactor ...

- Add DoT forwarding client (tls://IP#hostname upstream config)
- Recursive: cache NS delegations, serve-stale (RFC 8767), parallel
  NS queries on cold, no TCP fallback on individual UDP timeouts,
  400ms NS/TCP timeout (down from 800/1500ms)
- Reduce recursive p99 from 2367ms to 402ms (vs Unbound's 148ms)
- Refactor benchmark suite: generic compare_two engine, delete
  one-off diagnostics (1969 → 750 lines)
- Code cleanup: forward_query delegates to _raw, Option<String>
  for tls_name, saturating_sub for ns_idx

2026-04-12 18:40:46 +03:00

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