Use locked formatter output for the preservation assertion

The second source proof again completed the 63 command tests, terminal/file phases, type checking and lint, but retained a Prettier failure. Use the integrity-verified Prettier 3.9.9 package from this assignment’s supplied npm cache to format the remaining assertion; do not weaken the style check or touch runtime source.

Contract-Neutral: Mechanically formatted regression-test assertion only; no product or contract behaviour changes.
Change-source: pulse-maintainer

frontend-modern/src/utils/__tests__/agentInstallCommand.test.ts

@@ -613,9 +613,9 @@ describe('terminal-to-runtime token-file preservation', { timeout: 25_000 }, ()
             expect(readFileSync(join(fixture.dir, 'saved-changed'), 'utf8')).toBe(
               phase === 0 || input !== inputs[phase - 1] ? 'true' : 'false',
             );
-            expect(
-              execFileSync('stat', ['-c', '%a', state], { encoding: 'utf8' }).trim(),
-            ).toBe('700');
+            expect(execFileSync('stat', ['-c', '%a', state], { encoding: 'utf8' }).trim()).toBe(
+              '700',
+            );
             expect(
               execFileSync('stat', ['-c', '%a', join(state, 'token')], { encoding: 'utf8' }).trim(),
             ).toBe('600');