test(miner): drop union-unsafe testCommand access in stack-detection (#10006)

Keep the lex-order assertion on toMatchObject only so root tsc stays green.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: andriypolanski

test/unit/miner-stack-detection.test.ts

@@ -194,7 +194,6 @@ describe("detectRepoStack — Node (#4785)", () => {
     });
     expect(unitFirst).toMatchObject({ testCommand: "npm run test:e2e" });
     expect(e2eFirst).toMatchObject({ testCommand: "npm run test:e2e" });
-    expect(unitFirst.testCommand).toBe(e2eFirst.testCommand);
   });
 });