Drop registry test for removed @mastra/core/mastra-core env aliases

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Qard

js/src/instrumentation/registry.test.ts

@@ -261,24 +261,4 @@ describe("Environment Variable Configuration", () => {
     expect(testRegistry.isEnabled()).toBe(true);
     testRegistry.disable();
   });
-
-  it("should treat Mastra aliases as mastra instrumentation", async () => {
-    const iso = (await import("../isomorph")).default;
-    mockNewTracingChannel.mockClear();
-    iso.getEnv = (name: string) => {
-      if (name === "BRAINTRUST_DISABLE_INSTRUMENTATION") {
-        return "mastra-core,@mastra/core";
-      }
-      return originalGetEnv(name);
-    };
-
-    const testRegistry = new (registry.constructor as any)();
-    testRegistry.enable();
-
-    expect(testRegistry.isEnabled()).toBe(true);
-    expect(mockNewTracingChannel).not.toHaveBeenCalledWith(
-      "orchestrion:@mastra/core:agent.execute",
-    );
-    testRegistry.disable();
-  });
 });