Rename MuJoCo WASM output artifacts to mujoco.*.

This change updates the Emscripten build to output files named `mujoco.js`, `mujoco.wasm`, and `mujoco.d.ts` instead of `mujoco_wasm.*`. The internal CMake target name remains `mujoco_wasm` to avoid conflicts. The package name in `package.json` is also updated to `mujoco`. New enum tests are added.

PiperOrigin-RevId: 875140314
Change-Id: Ie03e0d1db2d03dd8582d5bfcb260b3d33549c2c9

wasm/tests/enums_test.ts

@@ -14,8 +14,8 @@
 
 import 'jasmine';
 
-import { MainModule } from "../dist/mujoco_wasm"
-import loadMujoco from "../dist/mujoco_wasm.js"
+import { MainModule } from "../dist/mujoco"
+import loadMujoco from "../dist/mujoco.js"
 
 let mujoco: MainModule;
 
@@ -40,6 +40,10 @@ describe('Enums', () => {
     expect(mujoco.mjtGeom).toBeDefined();
   });
 
+  it('mjtProjection should exist', () => {
+    expect(mujoco.mjtProjection).toBeDefined();
+  });
+
   it('mjtCamLight should exist', () => {
     expect(mujoco.mjtCamLight).toBeDefined();
   });
@@ -120,6 +124,14 @@ describe('Enums', () => {
     expect(mujoco.mjtConDataField).toBeDefined();
   });
 
+  it('mjtRayDataField should exist', () => {
+    expect(mujoco.mjtRayDataField).toBeDefined();
+  });
+
+  it('mjtCamOutBit should exist', () => {
+    expect(mujoco.mjtCamOutBit).toBeDefined();
+  });
+
   it('mjtSameFrame should exist', () => {
     expect(mujoco.mjtSameFrame).toBeDefined();
   });