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.

src/world.ts

@@ -7,6 +7,7 @@ import { ObservableLayer } from "./observable/observe";
 import type { QueryUpdate, RelationshipUpdate } from "./observable/events";
 import type { RelationshipDef } from "./relationship";
 import { Observable } from "rxjs";
+import type { WorldEvent } from "./observable/events";
 import type { WorldSnapshot } from "./serialization";
 
 // ── World ─────────────────────────────────────────────
@@ -40,7 +41,7 @@ export class World {
   private _observable = new ObservableLayer();
 
   /** Global event stream. */
-  get events$(): Observable<any> {
+  get events$(): Observable<WorldEvent> {
     return this._observable.events$.asObservable();
   }
 
@@ -435,7 +436,10 @@ export class World {
   ): World {
     const world = new World();
 
-    const compByName = new Map(components.map((c) => [c.name, c]));
+    const compByName = new Map(components.map((c) => [c.name, c])) as Map<
+      string,
+      ComponentDef<Record<string, unknown>>
+    >;
     const relByName = new Map((relationships ?? []).map((r) => [r.name, r]));
 
     // Map string ids → real Entity handles
@@ -453,7 +457,8 @@ export class World {
               `Pass it in the components array.`,
           );
         }
-        world.add(entity, def, value as any);
+        // Unknown at deserialization boundary; shape matches ComponentDef.defaults
+        world.add(entity, def, value as Partial<Record<string, unknown>>);
       }
     }