feat: module 09 turn pipeline

Module 9 lesson, scenarios, tests (8, both tracks), reference engines
(TURN phase list, conversion, content-registered hazards, win/lost),
WEAK Expansion Drop, harness.md M9 semantics, research notes (WEAK page,
baba-is-auto Game::MovePlayer, X IS NOT X placement reading).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

course/09-turn-pipeline/reference/rust/src/engine/mod.rs

@@ -0,0 +1,45 @@
+//! Engine core: generic rules machinery. Never name a specific card here.
+//!
+//! Module 1: every card in the game is an entity addressed by an id handle.
+//! The engine knows which zone each entity is in, who owns it, and when it
+//! entered play.
+//!
+//! Module 2: heroes, Health, Attack and Armor; triggered abilities; and the
+//! action queue that resolves a Sequence depth-first, recording an event log.
+//!
+//! Module 3: deferred death. Damage and destroy effects only mark minions; the
+//! Death Creation Step removes them when the outermost Phase ends, and Death
+//! Phases resolve their Deathrattles until no new deaths occur.
+//!
+//! Module 4: auras as card data, Aura Updates at defined points, and one
+//! routine that decides how many times a queued trigger activates. Playing a
+//! minion from hand, and Battlecries.
+//!
+//! Module 5: behaviour as data. Cards are definitions in the course's card format,
+//! loaded from JSON; one interpreter turns their effects into actions. Assemble
+//! builds a new card by swapping half of one card's text for half of another's.
+//!
+//! Part II lives in `puzzle`: a second engine, for the rule-writing puzzle game,
+//! beside the first.
+//! Module 6: the grid, the lexer and the parser.
+//! Module 7: `IS NOT`, and the resolution pass that turns parsed rules into rules in force.
+//! Module 8: movement, planned in full and then committed; push chains.
+
+mod assemble;
+mod aura;
+mod card;
+mod death;
+mod effect;
+mod event;
+pub mod puzzle;
+mod queue;
+mod world;
+
+pub use assemble::{assemble, register_assembled, AssembleError, Half};
+pub use card::{
+    Aura, Card, CardDef, CardLibrary, CardType, Clause, Effect, PoolFilter, Stacking, Target,
+    Trigger, TriggerOn,
+};
+pub use event::Event;
+pub use queue::{run_sequence, summon, Action, Ctx};
+pub use world::{Chooser, EntityId, PlayerId, World, Zone, HERO_HEALTH};