Model card: drop an unverified build note

Model card: link the generalist XMage build (danieljbrooks/mage, exp1-fdn-generalist)

Report: link the living roadmap on main instead of the tag's snapshot

Model card: draft-zero is public (MIT); state honestly what playing the checkpoints needs

Credit chrismaghuhn for advice on compute and performance

Experiment #1 release: checkpoints, deck pool, games, report (CC BY 4.0)

initial commit