[verified] fix(reconciler): recheck store snapshot after subscribe

[soloclz]

Summary

• Problem: useSyncExternalStore can miss a post-subscribe snapshot repair when Suspense + StrictMode remounts a store consumer and the store mutates during subscribe() without notifying listeners.
• Why it matters: the hook contract expects a snapshot re-check after subscribing, but this remount path skipped that repair step.
• What changed: subscribeToStore(...) now re-checks the snapshot immediately after subscribe(handleStoreChange) returns and forces a rerender if the store changed during subscribe.
• What did NOT change (scope boundary): this does not change broader Suspense replay semantics or attempt to guarantee that no stale intermediate render is ever observed before the repair rerender.

How did you test this change?

• CI=1 npx -y yarn test useSyncExternalStore-test --runInBand
• CI=1 npx -y yarn test useSyncExternalStore --runInBand

Related to: #35550