chore: update redirect links

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PR Summary

Low Risk
Low risk metadata-only changes, but incorrect version pointers could break downloads/redirects for latest Node.js artifacts.

Overview
Updates Node.js latest version pointers to v26.2.0 by changing latestVersions.json (including node-latest.tar.gz), updating the node-config-schema.json symlink target, and adding v26.2.0/ to the cached release directory list.

Refreshes cachedDirectories.json metadata (timestamps/sizes) for the release index and node-latest.tar.gz entry to match the new release.

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