v2.9.20 — RSS feed drift fully eliminated

Fixed

• RSS feed develop↔master drift fully eliminated — v2.9.19 derived the feed's <lastBuildDate> from _meta.last_updated, but that analysis timestamp is bumped on every publish even when content is unchanged, so v2-docs/feed.xml still drifted. It now derives from the freshest item's content date (changes only when the ranking changes). Verified deterministic and byte-identical across the develop/master digests (both 2026-06-18).

Full changelog: https://github.com/nubenetes/awesome-kubernetes/blob/master/CHANGELOG.md

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