Cards become JSON data in course/cards (one file per card, validated against card.schema.json and the catalog); the M5 references load them via registerCards and interpret effects, replacing content closures. Adds assemble(base, donor, half), the assemble/buffHand effects with an injected chooser, Fleshshape as the data-only Expansion Drop, and stages course/cards in verify-references and start-module. Co-Authored-By: Claude Opus 5.5 <[email protected]>