`useLinkStatus`: pending state sticky after navigation / shallow routing completes

This issue was created by an agent analysing CI failures from the Next.js Deploy Suite (vinext main vs Next.js v16.2.6, 2026-05-22).

Problem

useLinkStatus() is expected to return { pending: false } once a navigation has settled (including shallow routes). vinext reports pending: 1 after navigation, and the dev-overlay debug element never appears.

Expected pending: 0, received pending: 1 after navigation settles

Estimated Impact

~3 test failures across the deploy suite.

Affected Test Suites

• test/e2e/use-link-status/index.test.ts (3 failures)

Recommendation

1. Reproduce first in vinext's own test suite. Render a component subscribing to useLinkStatus() and click a <Link>; assert pending flips false after navigation.

2. Clear pending on navigation lifecycle end. Wire the link-status subscription to the navigation commit lifecycle. Include shallow routing in the clear path.

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Part of #1328.