Add S19j Pro Amlogic payload builder

[benjamin-wilson]

Title

Add S19j Pro Amlogic payload builder

Base

• Repo: skot/mujina-loader
• Base branch: main
• Head branch: codex/s19jpro-amlogic-payload-builder

Summary

• add a cross-build helper for mujina-minerd on the Amlogic target
• add a payload builder that stages mujina-minerd, startup scripts, config, and env into /home/root
• fix variable escaping in the full payload builder so host-side paths are not expanded into the target rootfs script
• update macOS USB burn and stock-restore scripts to accept Homebrew’s Apple Silicon libusb path
• document the new S19j Pro packaging flow
• ignore the new generated payload and output directories

Testing

• git diff --check
• bash -n mujina_loader/build_mujina_minerd_armhf.sh
• bash -n mujina_loader/build_s19jpro_amlogic_payload.sh
• bash -n mujina_loader/build_armhf_full_payload.sh
• bash -n tools/mujina-usburner/flash_stock_signed_mujina_image.sh
• bash -n tools/stock_fw_restore/flash_stock_s21_aml_macos.sh
• built:
  • mujina_loader/output/mujina-minerd-armhf
  • mujina_loader/mujina_armhf_s19jpro_amlogic
  • tools/mujina-usburner/output-s19jpro/aml_upgrade_package_mujina_s19jpro_amlogic.img