chore(setup): build miner from DragonX/drg-xmrig and rename staging dir
setup.sh now clones/builds the miner from git.dragonx.is/DragonX/drg-xmrig (was dragonx/xmrig-hac), and the prebuilt staging dir is renamed prebuilt-binaries/xmrig-hac -> prebuilt-binaries/drg-xmrig across build.sh, the legacy Windows build script, .gitignore and README. Also aligns setup.sh's section-8 directory list with section 7 (it previously used a bare "xmrig" token, creating a stray empty prebuilt-binaries/xmrig/), and updates the xmrig_manager.cpp header comment. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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