refactor: improve type safety in World and tests

Replace `any` types with specific interfaces like `WorldEvent`,
`QueryUpdate`, and `Entity` to strengthen type checking. This includes
refining the deserialization logic in `World.fromSnapshot` to use
properly typed component definitions.

test/serialization.test.ts

@@ -6,6 +6,7 @@ import {
   type WorldSnapshot,
   query,
   type RelationshipUpdate,
+  type WorldEvent,
 } from "../src/index";
 
 // ── Definitions ─────────────────────────────────────
@@ -269,8 +270,9 @@ describe("Serialization — complex state", () => {
     const playerId = snap.relationships.ownedBy[bulletId];
 
     // Player should have a name
-    expect(snap.entities[playerId]).toHaveProperty("name");
-    expect((snap.entities[playerId].name as any).value).toBe("Hero");
+    const playerComps = snap.entities[playerId];
+    expect(playerComps).toHaveProperty("name");
+    expect((playerComps.name as { value: string }).value).toBe("Hero");
   });
 });
 
@@ -403,8 +405,8 @@ describe("Serialization — observables after load", () => {
     w.spawn();
 
     const loaded = roundTrip(w);
-    const events: any[] = [];
-    loaded.events$.subscribe((e: any) => events.push(e));
+    const events: WorldEvent[] = [];
+    loaded.events$.subscribe((e) => events.push(e));
 
     const e = loaded.spawn();
     expect(events).toHaveLength(1);
@@ -417,8 +419,8 @@ describe("Serialization — observables after load", () => {
     w.add(e, Position, { x: 1, y: 2 });
 
     const loaded = roundTrip(w);
-    const updates: any[] = [];
-    loaded.observe(query(Position)).subscribe((u: any) => {
+    const updates: QueryUpdate[] = [];
+    loaded.observe(query(Position)).subscribe((u) => {
       if (u.added.length || u.removed.length || u.changed.length) {
         updates.push(u);
       }

test/world.test.ts

@@ -5,6 +5,7 @@ import {
   query,
   type QueryUpdate,
   type WorldEvent,
+  type Entity,
 } from "../src/index";
 
 // ── Components ──────────────────────────────────────
@@ -84,11 +85,11 @@ describe("Entity lifecycle", () => {
 // ── Components ──────────────────────────────────────
 describe("Components", () => {
   let world: World;
-  let entity = 0 as any;
+  let entity: Entity;
 
   beforeEach(() => {
     world = new World();
-    entity = world.spawn();
+    entity = world.spawn() as Entity;
   });
 
   it("add returns defaults", () => {