fix: accept pnpm release verifier arguments

tests/unit/pi-product-artifact.test.ts

@@ -92,6 +92,8 @@ describe('final Pi product artifact verification', () => {
       '--timeout-ms', '12000',
       '--report', 'release/evidence/pi.json',
     ], 'D:\\repo')).toMatchObject({ samples: 5, timeoutMs: 12_000 });
+    expect(parsePiArtifactVerifierArgs(['--', '--samples', '3'], 'D:\\repo'))
+      .toMatchObject({ samples: 3 });
     expect(() => parsePiArtifactVerifierArgs(['--samples', '0'], 'D:\\repo'))
       .toThrow('--samples must be a positive integer');
     expect(() => parsePiArtifactVerifierArgs(['--unknown'], 'D:\\repo'))