verify-references ran a bare `npx vitest run` in the staged reference, which
fetched an unrelated vitest that could not load the reference config. It now
installs the reference's devDependencies first. sync-check also checks each
module's expansion/tests against ### headings in expansion/README.md.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Naive engine in Rust and TypeScript (immediate damage, inline triggers,
recursive Deathrattles, cards defined in the engine) with
test_00_naive_runs and the expected-fail test_00_real_rules_whirlwind_order,
plus the Module 0 lesson.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
