Implement engine core: board assembly, movement, turns, combat, victory

Pure deterministic game core in @wizwar/engine: seeded RNG (mulberry32,
state in GameState so seed+commands replays identically), sector
assembly with rotation, junction merging, and wraparound warps
(configurable pairings; the 2p diagram crosses its side openings),
movement (3 + one number card), geometric line of sight, deck building
from the verified card data (asserts 125/200 totals), and the
command-to-event reducer: setup with TRAP! redraw and die-roll first
player, punching (no combat round 1, no self-attack, once per turn),
damage/death with killer-takes-cards and forced discard, treasure
stealing with both victory conditions, pick-up-ends-turn, and
end-of-turn draw. Events carry full spatial detail for future replay
rendering; private card knowledge rides on visibleTo events with a
redaction helper. 21 tests passing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/src/index.ts

@@ -1,32 +1,10 @@
-// @wizwar/engine — pure, deterministic game logic. No I/O, no timers, no
-// network: the server drives it in real time, the async mode replays it from
-// stored commands, and future AI players call it to evaluate moves.
-//
-// Card data, board layouts, and precise rule mechanics are pending
-// transcription of the 6th edition materials (see /research).
+// @wizwar/engine — pure, deterministic Wiz-War (6th edition) game logic.
+// No I/O, no timers, no network: the server drives it in real time, async
+// mode replays it from stored commands, and AI players call it to evaluate
+// moves. All game data is verified against the owner's physical 6e set.
 
-export interface PlayerId {
-  readonly id: string;
-}
-
-/** A single square on a sector board. Walls live on edges between squares. */
-export interface Position {
-  readonly x: number;
-  readonly y: number;
-}
-
-export type GamePhase = "setup" | "playing" | "finished";
-
-export interface GameState {
-  readonly phase: GamePhase;
-  readonly turn: number;
-  readonly activePlayer: string;
-  // TODO: board (sectors, walls, doors), players (position, life, hand,
-  // sustained spells, carried items/treasures), deck & discard, RNG seed.
-}
-
-/** Commands are player intents; the engine validates and applies them. */
-export type Command = { type: "todo" };
-
-/** Events are what actually happened; clients render from these. */
-export type GameEvent = { type: "todo" };
+export * from "./rng";
+export * from "./board";
+export * from "./cards";
+export * from "./setups";
+export * from "./game";