othala v0.6.2

Quieter health-probe logs, a markdown-sanitizer gap closed, and three
routine dependency majors.

- `kratos.yml`/`hydra.yml` set `request_log.disable_for_health: true` on both
  listeners, so health probes stop logging. Hydra's admin listener logs them
  anyway: probe Hydra's public `/health/ready`, as e2e does (smoke A0).
- Base image UBI 9 -> UBI 10; isomorphic-dompurify v4 (jsdom 30); nodemailer
  v10.

- Education markdown drops `<style>` and form controls.