Adds a Target Device section to TOOLCHAIN.md with specs gathered over SSH from the Anbernic RG35XX Plus. Confirms the device runs Ubuntu 22.04 with all required shared libraries (SDL2, FFmpeg) pre-installed, making the Buildroot toolchain unnecessary. Updates Possible Approaches to reflect that native arm64 container builds are confirmed working. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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