feat: module 05 assemble

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 <noreply@anthropic.com>

tools/start-module.mjs

@@ -32,6 +32,14 @@ mkdirSync(join(ws, "tests"), { recursive: true });
 for (const f of files) cpSync(f, join(ws, "tests", basename(f)));
 console.log(`Copied ${files.length} test file(s) for module ${num} into ${join(ws, "tests")}`);
 
+// The course's card data (read by your content from Module 5). Refreshed on every start;
+// card files you add yourself are kept.
+const cards = join(courseRoot(), "cards");
+if (existsSync(cards)) {
+  cpSync(cards, join(ws, "cards"), { recursive: true });
+  console.log(`Copied the course card data into ${join(ws, "cards")}`);
+}
+
 // Harness additions: module-local note, else the "- M<N>:" line of course/harness.md.
 const note = join(mod.path, "harness-adds.md");
 let adds = existsSync(note) ? readFileSync(note, "utf8").trim() : "";