Armada 20260723.c9736d7 — RP6 MVP test build

Flashable SD-card image (armada-YYYYMMDD.img.gz) for a fresh install, built from testing digest sha256:163c1c5b63ff9f7630d308c64ef4a08c460295e8172098c278798637203d449f.

Includes Retroid Pocket 6 (SM8550) support: device profile, panel/display kernel config, AYN-style controller mapping, stick RGB lighting, and the SM8550 GPU wedge workaround.

Flash with Balena Etcher, then flash the matching ROCKNIX ABL for SM8550 per the README before first boot.