Fix demo Space link

Release: SpikeWhale slider panel (HF dataset picker, stop/back), DaisyChain-Web (P2P WebRTC training, DaisyAdam, checkpoints, room host approval, verified-units-only)

Update README.md

Rename to DaisyChain-Train; link GitHub

Add GitHub link

Include bundled verified unit weights

Old-hardware training through emulated GPU logic