Tooling Fixed After Bootstrap

• Git LFS installed and initialized on Mac: git-lfs/3.7.1.
• Git LFS installed and initialized on Pi: git-lfs/3.6.1.
• Pi now has ripgrep, ffmpeg, 7z, and chdman from mame-tools.
• .gitattributes tracks large media, Dreamcast texture/model previews, assets/**, captures/**, and builds/** through Git LFS.
• intel/shachi-atoms/*.db is also tracked through Git LFS.