feat: module 0 rewrite trap

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 <noreply@anthropic.com>

naive-engine/rust/README.md

@@ -0,0 +1,16 @@
+# Naive engine: Rust
+
+The throwaway engine for [Module 0, The Rewrite Trap](../../course/00-rewrite-trap/lesson.md). It is written the obvious way on purpose: minions are shared references, damage applies at once, triggers fire inline, and a Deathrattle runs the instant a minion's Health reaches 0. Cards are defined inside the engine (`make_minion` and `cast` in `src/lib.rs`).
+
+Run the tests from this directory:
+
+```
+cargo test
+```
+
+You should see two passing tests:
+
+- `test_00_naive_runs` passes normally.
+- `test_00_real_rules_whirlwind_order - should panic ... ok` is expected to fail. It states the real game's event order, which this engine cannot produce, so it is marked `#[should_panic]`. To see the order the engine actually produces, delete the `#[should_panic(...)]` line and run `cargo test` again.
+
+Do not use this crate in Module 1. Your real engine starts from `workspace-template/rust/`.