SSR-1 Firmware Release Notes

20260627 - v2.2.6
  - First release for new hardware SSR1L (boards marked rev 'H' and later).
    (branched from SSR-1 legacy firmware 2.2.5)
  - Leveraged new hardware for improved recording performance (match SSR-1U/SDU)
  - Allow longer record file paths (match SSR-1U/SDU).
